CRACKS around doors, windows, and chimneys can be filled easily and with a minimum of muss with a recently developed calking compound. Supplied in a long, thin paper tube instead of a can, the material can be applied without special calking tools.
Q.—Is THERE any easy way to freshen up stucco without repainting?—R. C. Trenton, X. J. A.-IF THE stucco surface is not too dirty, a large portion of the dust and soot can be removed with a stiff-bristle brush. The surface also can be cleaned effectively by scrubbing with a soap-and-water solution, although this method requires a good deal of care to prevent smudging and streaking.
Thinks Motor Cars Might Take Their Alcohol Straight
Would Dig Up the Roots Of Our Family Tree
Wants a Pipe Organ That Won't Tie Him Down
An Echo From the Plane That Flies Like Sound
Club Houses for Crows To Keep Birds Off Wires
Suggests a Fire Ladder With Elevator Service
Replace Your Cast~Offs With Cast~On Clothes
Another Champion Of the Steam Car Speaks
Lawn~Cutting Slave Wants Stunted Grass To Free Him
Australian Checks Up On Fish’s Feeling
He Likes Them All— Especially Glass Blowing
What, We Wonder, Is Wrong With Greenwich Time?
Birds and Beasts Would Adorn His Wood Projects
Model Builder Supports Plea Of Railroad-Minded Colleague
Advocates Supreme Test In “Motorists’ Clinic”
Putting Awnings In Their Place
Why Not Run the Bicycle With the Extra Current?
He’d Have Jacks Pop Out of Car Chassis
Don’t Overlook the Tools, Says This Reader
A Case of Two Negatives Causing a Rift in Clouds
She Would Bake A Good Batch of Pottery
You hear a lot of talk these days about finding a substitute for gasoline as a motor fuel. Several foreign countries have laws requiring the use of an alcohol-gasoline blend for this purpose. Some prominent chemists advocate that we do the same thing in this country.
IN A darkened auditorium at Trenton, N. J., a few days ago, nearly 500 police officials sat fascinated by a new kind of talking picture, an animated rogues’ gallery which soon may rank with fingerprinting as a scientific aid to identification.
Unexploded Shells, Buried in the Soil Of France Since the World War, Afford A Grisly Harvest for an Odd Industry
THOMAS M. JOHNSON
IT WAS night on the old battlefield. Eerie shapes loomed— jagged, ruined walls; tortured, stunted trees; webs of barbed wire; blasted earth upheaved from craterlike shell holes. In one hole a fire burned, spreading its ruddy glow over a scene that was weird indeed.
A NOVEL homemade windmill generator that cost less than three dollars utilizes the rear end and differential gears salvaged from an old auto. Twelve-foot blades are fastened to one of the car wheels, and the assembly is mounted on a rotating support on top of an improvised tower.
PORTABLE underwater lighting equipment has recently been developed to aid in searching the bottoms of lakes, ponds, and rivers at night. Powerful floodlamps are mounted in water-tight, highly polished reflectors, and fastened to the ends of long, lightweight poles.
GREATER efficiency in working with portable electric tools is made possible by an overhead track and trolley system designed for use in shops and manufacturing plants. Shown below installed in the cutting department of a clothing factory, the system provides a continuous outlet contact for tools, thus eliminating long cords that get in the operators’ way.
BEFORE DESCENDING into street manholes to repair underground cables, telephone workmen now use a carbon monoxide detector to reveal the presence of dangerous amounts of the poisonous, odorless gas. A sealed glass tube, containing a chemical solution, wrapped in cotton, and covered with a transparent envelope, is crushed and suspended in the manhole for ten minutes.
HURTLING through the night at a speed of more than a mile a minute, the Mercury, new streamline steam locomotive just completed for the New York Central Lines, will present a weird appearance with its brightly painted, seventy-nine-inch driving wheels illuminated by floodlights concealed under the cowling.
IN ONE of the hottest places in the United States, the sunbaked desert near the Salton Sea in California, an unusual industry is extracting “dry ice" from the fumes of a baby volcano. This odd enterprise owes its birth to the curiosity of Mrs. Carl M. Einhart, shown at the left, whose interest in the characteristic “mud pots,” smoking holes in the slate-gray mud of the desert, led her to have the fumes analyzed.
UNSOLVED mysteries of the earth’s interior are being studied with the aid of a tiny instrument known as a “magnetometer,” recently installed at an observatory in California. The device contains a bar magnet, suspended on a twisted thread of quartz, which acts like a compass needle and responds to changes in the earth's magnetic field.
A NEW oil-bath air cleaner for automobile carburetors is said to be so efficient that it operates perfectly even during a severe dust storm. Air entering the cleaner is led into a dense oil fog or mist, which traps the dust, allowing only clean air to pass along to the carburetor.
WHEN you approach a mirror of new design to straighten your tie or adjust your hat, a concealed phonograph startles you by launching into a glib advertising talk. The apparatus is actuated by a sensitive detector, in the form of a metal loop, which responds to the changed electrical capacity of the surroundings when you step within range.
DARKROOM workers of the Mt. Wilson Observatory at Pasadena, Calif., must be careful lest the astronomers’ pictorial trophies slip through their fingers—for the smallest of the photographic plates used in recording discoveries in the depths of space measures only one quarter by three quarters of an inch.
BEAUTIFUL hooked rugs are declared easy to make with a new “rug needle,” which dispenses with the use of a crochet hook for pulling yarn or strips of rag through the mesh of burlap. Turning a crank upon the labor-saving tool automatically forms the necessary stitches, looping the material evenly.
PORTABLE military signal sets, using unseen beams of black light, are made practical by the invention of a receiving outfit 180 times as sensitive to infra-red rays as any previously known. These invisible rays have hitherto been picked up by a thermocouple, a sort of electrie thermometer.
FRUITS and vegetables may now be inspected before marketing, by a method as simple as the candling of eggs, with the aid of a portable X-ray outfit developed for the purpose at the University of Minnesota. Shadow pictures clearly show whether an apple is rotten at the core, or a potato hollow at the center, when it is placed in the path of the rays and examined with a viewing screen held in the hand.
IN STUDYING the effects of a mothproofing compound, experts at a New Brunswick, N. J., laboratory maintain a unique moth farm. The moth larvae are raised in feathers as shown below, later transferred to glass bowls, and finally taken to a laboratory where they are placed on various samples of cloth which have been treated for protection against moths.
A MECHANICAL “beach comber” at Venice, Calif., shaves off the sand to a depth of four inches, screens it for glass, litter, and valuables, and returns the cleaned sand to the beach. Metal-edged wire scoops, in a revolving drum, lift the surface material into compartments which retain the litter but let the sand sift through.
ELECTRIC pliers of a type now available can be used to melt solder and to perform many other useful operations where heat is required. Current for the tool, which is illustrated above, is supplied to the jaws of the pliers through heavily insulated wires leading into the long handles.
To DEMONSTRATE the advantages of scientific control in the manufacture of Swiss cheese, the U. S. Department of Agriculture will send two “traveling Swisscheese laboratories” into Wisconsin and Ohio, largest producing centers in the country.
Name Your NOISE ... The Sound Libraries Have It Sealed in Wax
Phonograph Records Preserve an Audible Histoty Of Our Civilization, as Sounds of Daily Life Are "Canned" for Use in Movies and Radio
THOUSANDS of noises, ranging from the faint squeak of a shoe to the thundering roar of an erupting volcano, are now available permanently recorded in wax. The disks of modern “sound libraries” provide an amazing array of “canned” clamor that is providing many of the true-to-life sound effects in theaters, talkie sets, and broadcasting studios.
ON A 250-FOOT MINIATURE BOULEVARD, ENGINEERS USE MODEL MOTORS AND MEN AS COUNTERS IN A GAME TO SAVE LIFE
The Test Model Under Ordinary Road Lights ... And With Scientifically Designed Equipment
WALTER E. BURTON
IN A strange laboratory at Cleveland. Ohio, research engineers spend their days playing with toys. On a miniature automobile highway the length of a city block, they arrange tiny models of men, motor cars, and dogs; then they throw switches that flood the make-believe boulevard with various kinds of light from every possible angle.
LENSES containing not one but 220 individual openings; zoom lenses which focus from long shot to close-up in the twinkling of an eye; high-speed cameras which slow down motion for comedy and dramatic effects; cameras clothed in oilskins for shooting indoor storms; moving paintings on glass which surpass nature in beauty; chemical baths and double exposures; and a variety of focusing devices, movable platforms, and booms make possible the creation and filming of motion-picture effects which until recently were only figments of a vivid Hollywood imagination.
WEIGHTED with sand and clothed in discarded flying suits, old shoes, and leather helmets, dummies made to resemble airplane pilots look like gruesome war casualties as they slump against the wall in the picture shown at the right. Nicknamed “Sandbag Squadron Leaders” by the pilots of the British Royal Air Force, the dummies were used for parachute jumps in recent aerial maneuvers at Henlow Aerodrome, England.
PLANNING to row the entire distance in a snub-nosed, flat-bottomed boat, a city engipeer recently completed preparations for a strange six-mile inspection trip through a large sewer underneath the streets of Los Angeles, Calif. Equipment of the boat included a powerful, battery-operated searchlight, a short-wave radio, and cylindrical pontoons to keep the craft afloat in case of accident.
MOUNTED on two standard-size auto wheels, a new streamline utility trailer for passenger cars weighs approximately 485 pounds and has an overall length of eight feet. Of all-steel construction, the trailer has a hinged cover and tail gate, and will carry a maximum load of 1,200 pounds.
TO PROVE to agricultural leaders that silkworms can be raised successfully in this country, John Ousta, a silk expert, is cultivating thousands of the worms on mulberry leaves strewn on a table in his New York City home. The worms are said to be exceptionally healthy and to produce a high grade of raw silk.
PEOPLE talk faster now than they did a few years ago, according to a recent report of the number of words taken down by official stenographers in London law courts. Although court hours and methods of procedure have not changed materially, the average number of words has increased from 30,000 a day less than a decade ago, to a total of more than 40,000 at the present time.
VOLCANIC GASES spouting from craters and mountainside smoke holes are being collected and studied by scientific expeditions to reveal the secrets of the mighty forces that lie deep in the interior of the earth. Flexible tubes lowered over the brim of a seething mountain crater tap samples of the gaseous smoke, which are analyzed in temporary laboratories set up on the slopes of the volcano.
FOSSILS are photographed without a.camera by a process in use at the Texas Technological College at Lubbock, Tex. After a thorough polishing, the fossil is bathed in weak hydrochloric acid, which etches the fossil structure into its rock base.
POWERED by a four-horsepower engine, a vehicle recently constructed by a French inventor combines the features of an automobile, a motor boat, and a submarine. The amphibian craft is said to attain a speed of twenty-five miles an hour on land, nine miles an hour on the water, and six miles an hour when submerged.
TAILOR shops on wheels now travel about the city and suburbs of London, England, bringing valet service direct to the customer. The large, six-wheeled trucks are equipped with modern drycleaning apparatus and generate their own steam for their pressing machines.
PREHISTORIC rhinoceros bones take the place of conventional wooden resonators in a novel xylophone-type musical instrument recently constructed by Henry P. Reider, staff member of the Nebraska State Museum. While assembling rhinoceros skeletons unearthed near Ainsworth, Neb., Reider noticed that the ancient bones had a mellow ring when knocked together.
WITH two wooden display counters hanging on straps in sandwich-board style from his shoulders, the picturesque British peddler shown in the picture above tours the English countryside as a walking clock shop. Advertising placards, made from old clock dials and attached to his hat, proclaim that he is willing to trade his stock of twelve new clocks for old ones —provided, of course, that the purchaser agrees to add an acceptable sum of cash to the trade-in value of the old timepiece.
TWIST DRILLS are sharpened with great precision by a new type of grinder. The drill, after being securely clamped in a chuck, is automatically guided back and forth against an electrically driven grinding wheel. Since the drill is free during the grinding, the sharpened lips are identical in respect to length and clearance.
BOXING BOUTS are scientifically conducted by a new mechanical timing device. Mounted prominently above the ring, the mechanism times each round and automatically sounds the opening and closing gongs. Numbered lights flash on to indicate seconds and a loudspeaker announces the knockdown count.
BECAUSE a number of workmen repairing gas mains in the streets of Chicago, Ill., have been injured recently by automobiles, a new type of safety barricade has been constructed to supplement warning signs. The L-shaped protective fence is made of heavy planking reënforced with steel.
SUPPLEMENTING their classroom studies, two architectural students at the Massachusetts Institute of Technology, Cambridge, Mass., designed an attractive colonial dwelling, a model of which is illustrated. The entire architectural class has now selected and negotiated the purchase of a suitable building plot, and will superintend the construction of the house under actual conditions of architectural practice.
PLATES, cups, and saucers made of clear sugar candy have recently been marketed as a novelty for parties and social entertainments. After refreshments have been served, guests can eat their dishes as an extra dessert. While still hot and in a liquid state, the cooked sugar confection of which the dishes are made, is poured into patterned molds where it hardens into edible forms resembling real glass or crystal.
PEDESTRIANS walking at night along the sides of unlighted roads are protected by a new safety belt which reflects the headlight rays of oncoming cars. Worn over one shoulder like a sling, the leather strap is studded with small reflector buttons, whose gleam is visible for 1,000 feet.
WHAT is believed to be the biggest single-step enlargement of a photograph ever made, was exhibited recently by Ivan Dmitri, prominent photographer. The unretouched enlargement, showing a herd of wild horses, is over eleven feet long and forty inches high, and was made in one step from the tiny section of negative, only three eighths by one and three eighths inches, shown in the circle.
CAUGHT by the camera as she dived to the floor of her pool and stretched out her neck for a dainty morsel of food, Barbara, prize polar bear at the zoo in London, England, presents a strange appearance in the photograph reproduced above. The odd shot was snapped through the thick glass windows of her swimming tank.
GOATS raised in the United States for their milk now number more than 5,000,000. RAIN falls within the Washington Monument on warm days after cool spells. LIZARDS of a species found in Egypt never drink. They get their water supply by absorbing dew through their skin.
To PROVIDE adequate treatment while flying emergency cases to medical centers or base hospitals, an all-white, speedy hospital plane has just been completed at Hanworth Airport near London, England. Driven by two ninety-five-horsepower engines, the unique flying hospital is completely outfitted with the most modern medical and nursing equipment, including oxygen and blood-transfusion apparatus.
POLO PLAYERS may have the advantage over golfers in a new and novel game called "polo golf. ” Although no ponies are used and the scoring, and rules are the same as in golf, all shots in the game are made with a single club that has double-ended, compositionrubber head resembling a polo mallet.
INMATES of the model state prison at Statesville, Ill., are housed in four tiers of cells constructed in a wide circle. Each of the four huge circular cell blocks in the prison can be guarded by one man. Stationed in a central control tower at the hub of each block, the guard has an unobstructed view into every cell.
A niateurs Invade the Airways as New Planes Bring Aviation Within the Reach of Everyone
ALDEN P. ARMAGNAC
MORE than half of the airplanes produced in this country are being sold to private flyers. Tucked away in the latest aviation statistics, that significant fact reflects a remarkable trend in American aviation. Amateur pilots are stealing the show from professionals.
Life Story of The Black Widow and Her Insect Enemy
Amazing Photographs Show How a Rare Parasite May Curb a Deadly Poisoner
The Black Widow Meets Her Match in a Clever Parasite Fly
GEORGE ELWOOD JENKS
CARRYING deadly, drop a poison for drop, that than is more the venom of the rattlesnake, the Black Widow spider has become a real menace to life. Under natural conditions it is kept in check by weather and by its bird and insect enemies. In the artificial shelter afforded by houses, barns, and outbuildings, it is multiplying rapidly, and the mounting toll of deaths from spider bites has become a serious problem to health departments in many states.
CLAWING the ocean floor with a row of gigantic, seventy-ton grappling tongs, a mammoth 715-foot salvage vessel proposed by a Wyoming inventor would dig wrecked ships out of their watery graves and hoist them to the surface. According to the design, the 100,000-ton craft will be essentially a floating dry dock with an open well, 600 feet long and 150 feet wide, in the center.
TO ASSIST reporters in covering outstanding meetings and public events throughout the country, the department of communications in France has fitted out a large truck as a mobile telephone exchange. Equipped with a central switchboard and numerous hand-type telephones, the truck is driven to the scene of an important news event and there connected to local telephone lines.
A NEW CONVENIENCE for physicians and nurses is a hollow mechanical pencil which also serves as a carrying case for any style of clinical thermometer. Within the body of the jointed pencil, a steel clip grips the thermometer securely to prevent it from falling out accidentally or from shaking around inside the case of the pencil while being carried in the pocket.
BLOWING giant soap bubbles is the odd hobby of Wallace Block of Buffalo, N. Y. By expert and careful puffing into a homemade paper cone instead of the conventional clay pipe, Block creates mammoth soap spheres with ordinary suds. He is shown in the picture at right finishing off a huge bubble blown around a candlestick on a tin plate, an example of how he manipulates the filmy globules.
To PREVENT accidents at unattended railway crossings, a new type of safety guard is being installed by an eastern railroad. When a train approaches the crossing, metal barriers housed in a recess in the highway rise automatically and gradually to a height of nine inches and then lock into position.
BUILT into the center of the living-room floor, a garden goldfish pool gives a novel outdoor note to the new home of a Hollywood film comedian. Ferns and small garden plants grow in a shallow trench which surrounds the concrete fish pond. An urn for ivy and similar plants stands on a pedestal in the center of the pool.
CHURNING the air with wing-shaped paddles mounted on giant, wire-spoked wheels, an odd plane recently devised resembles a pair of flying Ferris wheels. Mounted on a single axle supported by struts jutting upward from the cabin, the “bicycle-type” wheels lift and propel the plane as they are whirled by driving gears connected to a motor in the fuselage.
TINY ROLLS of movie film may replace books, tnagazines, and newspapers in the libraries of the future, if a new reading machine comes into general use. Microphotographs are made of printed pages so that an entire novel can be reproduced on a few feet of noninflammable, durable film.
DECORATIVE lines on automobiles are easily painted with a new striping device. Working like a fountain pen, the liner has a knurled roller tip which assures a steady flow of paint from the supply reservoir. An adjustable wire guides the device and holds it steady when in use.
BLIND PERSONS can “read” ordinary printing with a new scanning device now being perfected at Northwestern University. Suspended over a printed page, the apparatus is guided on small rollers along a line of type flooded with strong light.
BOTH time and direction are indicated by an ingenious combination compass and watch, recently devised for use by sportsmen, explorers, and engineers. A thin strip if metal, shaped into a carefully calculated curve, is soldered to the hour hand near its axis, while a thin line which curves in an opposite direction is drawn on the watch face.
LETHAL BEAMS of light radiate from an electric “death-ray” machine developed by a California inventor. The apparatus is said to project a mixture of ultrashort radio waves and infra-red radiations from powerful lamps mounted in a searchlight.
BY INSERTING a new photograph album into a picture frame recently introduced, photographers can display their favorite snapshot without removing it from the album. Finished to resemble leather, the frame opens at the back to admit the album.
CHECKS sent out by the Federal Government are automatically signed and countersigned by a new machine recently placed in operation by the United States Treasury Department. Capable of affixing signatures at the amazing rate of 12,000 an hour, the device is for use on Government payroll checks and such obligations as World War bonus payments.
SKIMMING over the water at a top speed of forty-five miles an hour, a new “crash boat” completed for the U. S. Navy will rescue student flyers and their planes in case of accidents near their seaplane training base. Powered by four 300-horsepower marine engines, the twenty-one-ton rescue boat is thirteen feet wide and has an inverted V-type hull.
TORCHES borne by athletes of old have been brought up to date for the first modern observance of an ancient ceremony. More than 3,000 runners, bearing flaming stainless-steel torches like the one illustrated, will take turns in carrying a symbolical flame 1,900 miles from Olympia, Greece, to Berlin, Germany, to mark the opening there of the 1936 Olympic games.
BY PLACING its drive directly beneath the bench top to which it is fastened, instead of overhead or at the rear, the designer of a new metal-working lathe for home-workshop enthusiasts provides novel advantages. Turning a crank handle within easy reach raises the pivoted driving unit to release the belt and facilitate shifting it for varying spindle speeds.
“NERVOUSNESS” is measured by an electrical device recently developed by Dr. Edmund Jacobson of the University of Chicago, which gauges the electrical activity of a subject’s nervous system. Fine wires are inserted directly into a superficial nerve, and the heavily-shielded apparatus registers electric currents as small as four millionths of a volt.
RESEMBLING a fountain pen. a new pocket scale weighs letters and small packages to determine the postage required. A letter, held in a clip at one end of the scale, pulls down a calibrated rod attached to a Small Spring.
ARTIFICIAL respiration can be applied for long periods to save the life of a victim of submersion, without fatigue to the rescuer, through the use of a new mechanical resuscitator developed in France. When the subject is laid prone with his forehead resting against a rubber-covered support, and a leather strap is made fast across his back, pumping a handle up and down automatically induces the diaphragm movements that occur during the course of normal breathing.
UNDER the watchful eyes of keepers, children play with lion cubs, pigs, penguins, parrots, small pythons, a chimpanzee. and other animals in a novel "Pets Corner" in the London, England, Zoo. The idea, as the picture indicates, is a popular one.
GESTURING realistically with its long metal arms and turning its massive head from side to side, a mechanical man recently constructed makes an animated educational speech on the subject of “Men and Machines,” as part of the exhibit of the U. S. Department of Labor at the Texas Centennial Exposition.
BY RINGING a bell whenever the wind reaches gale proportions, a device mounted on a railroad viaduct in England warns that the bridge is unsafe. The wind’s velocity is measured by its pressure on a disk attached to a spring.
WHEN a letter is written on a new type of writing paper, it is folded and sealed with a small, gummed flap projecting from the side of the sheet. The address, written in the lower left-hand corner of the letter, is visible through a window cut in the paper, saving the cost of an envelope and the work of addressing one.
DETECTING the presence of disease or infection in the human body is the reputed accomplishment of an electrical machine recently demonstrated in London, England. The device operates on the theory that disease causes a change in the electrical capacity of the parts affected.
THRICE daily for eighty years, members of a Rome, Ga., family have made rainfall observations on a rain gauge set up in the back yard of their home. R. F. Norton, an amateur weather observer, designed and erected a gauge there in 1856, and kept records for twenty-four years.
CAPTURING NEMAS AND PREPARINGTHEM FOR THE MICROSCOPE
Recording Microscopic Subjects With Paper and Pencil
SCIENCE MAY REALIZE ALCHEMIST’S DREAM
BOYS ARE LEFT-HANDED MORE OFTEN THAN GIRLS
MORTON C. WALLING
NO MATTER where you explore with your microscope, you may find nematodes, dragonlike worms which are engaged constantly in a writhing dance, and whose numbers are believed to be greater than the insect population. Amazing are the variety and distribution of these important but, to the average person, almost unknown creatures.
Whirling Wheels Stand Still When Viewed Through HOMEMADE STROBOSCOPE
This Article Tells How To Make and Use a Device That “Freezes” Machinery And Other Moving Objects For Interesting Tests
TESTS SHOW ECONOMY OF WASHING WINDOWS
MARRIAGE AIDS HEALTH
EVEN the simplest device of modern science would look like black magic to our ancestors, if they could come back and see it work. Imagine, for instance, the wonder which you could arouse in your great-grand-father’s mind if you asserted that you could read a word chalked on the side of a rapidly whirling flywheel—and actually did read it!
Making Real Test Papers, And Preparing Substances For Odd Chemical Stunts, Serves To Introduce You To the Fascinating Field Of the Carbon Compounds
Raymond B. Wailes
ARE you an amateur chemist looking for something new to try in your home laboratory? If so, you will enjoy a little venture into the realm of organic chemistry. Most of the chemicals on your shelves —for example, common salt, copper oxide, magnesium chloride, and sodium silicate—are inorganic, or of mineral origin.
PENDULUMS of different lengths will have the same periods of oscillation, so long as their weights are swinging at the same level. In this experiment, the pendulum at the left is allowed to swing back and forth in the ordinary manner, while the longer one at the right is operated as a “conical pendulum”—that is, swung in a circle as indicated by the dotted line.
FOR experimental tests and trouble shooting, the amateur set builder will find the inexpensive tester illustrated at the right a handy addition to his tool kit. Small enough to fit a coat pocket, the combination meter measures either resistances or voltages.
CLEVERLY disguised as an attractive picture, this novel homemade radio set can be hung on your wall. To all appearances, it is simply a framed piece of decorative tapestry supported by a gilt picture cord. Yet, its three-inch depth hides an efficient all-electric, five-tube broadcast receiver—loudspeaker and all.
GOT anybody here that can fix brakes so they’ll hold?” called the driver of a travel-worn coupe, as the car rolled to a squeaking stop in front of the Model Garage. Gus Wilson, veteran auto mechanic and part owner of the business, pulled his head out from under the hood of a shiny new sedan he was tuning up.
WHEN the white man provided the American Indian with a cheap trade musket in place of his native bow and arrow, he saved himself a good deal of grief, for had the red man developed his weapon along a logical path he might have arrived at an approximation of the bow we now know as the “semiIndian,” “flat,” or “American” bow.
COMPACT and complete, this back-yard summer resort for small children includes a wading pool, sand-box, and shelves on which to put away boats, pails, and beach balls. Removable awnings protect against sunburn and on cloudy days are stored beside the tiny “cottage.”
GARDEN HOSE REEL SWINGS OUT OF SIGHT BENEATH PORCH
ONE of the most accessible places in which to store a garden hose is beneath a porch. This can often be done quite easily by mounting the reel on a revolving door, as illustrated, so that the hose is out of sight when not in use. The door takes the place of the latticework with which the space under porches of this kind is usually inclosed.
YOU will never lack a diversity of lamps if you build the candelabra pictured above. The five ivory candles with their linked holders may be arranged in seven distinct shapes to suit the available space or the mood of the moment. The candleholders are turned from walnut or mahogany stock 2 in.
HERE’S a novelty in pipe racks. Two of your favorite briers form the legs and feet of a gayly attired, timid-faced dusky youngster. It will serve equally well as a wall or a table rack. Only five pieces are necessary. The figure is made from thick wood.
Novelty is Keynote in This Month's Selection,Which Includes a Unique Refreshment Tray With a Whittled Wooden Cactus in the Center for Holding Titbits
D. W. PRINCE
LIGHT refreshments at bridge or tea are attractively served on this tray. In the center is a cactus plant carved from wood, which holds brightly colored toothpick skewers for dainty titbits. Ample room is found on the tray itself for sandwiches and beverages.
A DISTINCTIVE setting for a favorite bit of bric-a-brac is the eighteenth century hanging bookshelf illustrated. It is made doubly charming by its mirror back. If, in addition, the mirror is of dark blue plate glass, a particularly rich effect is obtained.
NEW Thermal Hunter PLANE MODEL Built To Break Records
STREAMLINED OUTDOOR DURATION FLYER CLIMBS ON ITS OWN POWER AND GLIDES A LONG WAY ON RISING AIR CURRENTS
HERE is a model airplane that may break the existing world records for flight this summer. By utilizing the rising air currents, this so-called “thermal hunter” quickly attains considerable height, and its gliding range is much longer than the average miniature craft.
SCALES FOR WEIGHING CHEMICALS BUILT AT TRIFLING COST
R. O. L
CONSTRUCTED mainly from left-over scraps of material at a cost of not more than twenty-five cents, the scales illustrated are sensitive to within a grain and therefore amply accurate for photographic work and all but the more exacting chemical experiments usually undertaken by amateurs.
A COMFORTABLE garden chair may be constructed at home from ordinary water pipe, a few fittings, and a gayly colored piece of awning. The method of assembling is shown in the photograph. Rummage any junk yard for a quantity of ½-in. pipe or electrical conduit and buy six ells, eight tees, and four pipe caps.
"BENT motor-boat propeller blades can usually be straightened by using a pair of large C-clamps with much less danger of bending the shaft than would accompany any attempt to hammer them into shape. One end of a strong piece of wood is clamped to the blade near the hub as shown above, and with the other clamp the bent portion of the blade is drawn into position.
A TTRACTIVE hand-tooled leather bracelets and bar pins require but little time and expense to make. They are durable, light in weight, and can be prepared in a variety of colors to match any shade of wearing apparel. Two-tone effects are obtained, if desired, by using contrasting colors of lace and painting the initials or monograms with leather lacquer.
OUR effort to build a sailboat at low cost resulted in the development of what we believe to be an original design of track and sail slides, the total cost of which was less than a dollar for a 16-ft. Marconi-rigged boat. The track was made of inexpensive flat iron, drilled and countersunk at 10-in.
THE flash-light holder illustrated above was made from discarded flat leather machine belting and fastened with metal lacing. If preferred, the joints could be sewn or laced with leather thongs. The slot in the ear piece fits over the belt of the person using the flash light.
AUTOMOBILE engines are becoming increasingly popular for motor-boat use. An excellent engine may be obtained for from $15 to $30, but difficulty arises in devising an inexpensive connecting link between the engine and the propeller shaft.
OFTEN when one is working on small motors and generators, the use of a small electric soldering iron is imperative in order to reach various inaccessible parts, yet it usually will not hold sufficient heat to complete the job satisfactorily.
TO MAKE it easier to bend celluloid toothbrush handles into perfect circles, when making celluloid rings, either of the methods illustrated will be found satisfactory. In the one shown above, a short piece of pipe is inserted in a hole in a wood block, and a brad is driven into the block to secure the end of the toothbrush handle.
How to bake vegetables and even bread without an oven... A selfstoking fire for soups and stews... Bean holes. . . Seminole dinners
MAURICE H. DECKER
WHEN several men go camping together, the fellow elected as cook has the least fun of all. And the most work! I know because I’ve been that one many a time. At first I thought it was an honor, but that soon passed. I got tired out stooping over a smoky fire while the rest swam, fished, hiked, or just loafed.
IN WOOD finishing—as, indeed, in all painting—there is nothing that so completely distinguishes the amateur from the professional as the manner in which he handles his brush. All standard brushes have three portions: the bristles; the ferrule, which shapes and holds the bristles in permanent form; and the handle, of various shapes, which adds balance to the whole assembly and at the same time enables the brush hand to use the tool correctly and in a practical manner.
FEW thrills compare with a ride on an aquaplane behind a fast runabout. Of course, the aquaplane must be a good one, easy to manipulate, but stable. It must have the right hitch, the riding angle must be correct, and there must not be too great a drag for the power available.
MOTOR boats up to about 25 ft. in length can be raised at the stern for making repairs to the propellers, struts, propeller guards, and other underwater parts by the use of a homemade boat jack like the one illustrated. The boat should be in shallow water close to a sand bar or bank so the propeller guard touches bottom.
IN THE absence of a woodworking shaper, a bench lathe can be utilized to make simple cove-molding cuts in small stock. The method has proved entirely satisfactory for the quantity production of the shapes illustrated below, which were used as bases for photographs and photographic statuettes.
THE simplest tool-marking fluid that contains no acid can be made by dissolving 12 grams of copper sulphate crystals and 10 grams of salt in 40 c.c. of water, or approximately a teaspoonful of each of the chemicals in 2 oz. of water. The fluid is applied to the metal by means of a wooden stick, a pointed brush, or a sliver of quill from a feather.
IF A BLOCK is made similar to the one illustrated above, it is not necessary to take the time or trouble to tilt the bandsaw table when cutting off corners of square stock to prepare it for turning on a lathe. Dimensions are immaterial, but the angle should be 90 deg., and each side upon which the wood to be cut rests should make a 45-deg. angle with the base.
LET your imagination and ingenuity have a chance, the next time you build a kite. Here are a number of suggestions. Note particularly the pentagon box kite by Elwood Yeager, of Pasadena, Calif., and the reel he uses when flying it. The sailboat messenger at the bottom of the page is another novelty; when it reaches the kite, its sail is automatically furled and it slides down again.
MY OWN early experience and later observations of other men at work have led me to believe that many owners of small circular saws do not use them to the best advantage. This is possibly due to the dearth of simple, detailed information. Upon obtaining such a machine, one is presumably expected to be able to use it.
The Yards Are Swung as if by Magic to Suit the Wind— An Old Alarm Clock Hidden in a Deck House Provides Power for the Mechanism
IF YOU are one of the many thousands of readers who have constructed models of square-rigged ships, barks, and brigs, you have probably wondered if it would not be possible to make a model that would actually sail. Why is it that sailing models are almost invariably yachts or schooners and not squareriggers ?
ALMOST every amateur photographer tries, at one time or another, to take flash-light pictures. While the familiar method of opening the shutter with one hand, flashing the bulb with the other, and then closing the shutter works quite well with posed pictures, it is a trifle too slow for most purposes.
A CAR with a dead battery generally can be started easily by making use of the simple kink illustrated. The contact at the bumpers provides a mutual grounding connection, while the heavy, insulated wire connecting the two starter terminals completes the circuit.
INSTEAD of removing the valve the next time you want to deflate an inner tube, just spread the legs of a one eighth by one-inch cotter pin slightly and push it into the valve stem. The ends of the prongs will push down the valve, while their springiness will hold the cotter pin in place.
NEW radiators can be protected from corrosion with a homemade solution of potassium chromate and distilled water— two teaspoonfuls of the chemical to five and one half gallons of water. When the radiator has been filled, boil the solution for a minute or so by holding a newspaper in front of the radiator while the motor is running.
IN AN emergency, a spare-tire fender well can be used as a handy water trough for testing leaky inner tubes. Simply plug the drain hole in the bottom of the well with a wad of cloth or paper and fill with water. The partially inflated tube then can be submerged as shown at the right and rotated slowly until air bubbles appear to indicate the leak.
WHEN removing or replacing spark plugs on a car fitted with an aluminum cylinder head, it is difficult to prevent the wrench from digging into the soft metal. To protect the cylinder head on my car, I cut a large rubber washer from a piece of inner tubing to fit the recess.
AFTER several years of continual scuffing and kicking, the forward edges of the cowl panels on most small cars are badly worn. To cover up the worn spots and prevent any further wear, I recently installed a metal plate at the lower front corner of each panel on my car.
Capt. E. Armitage McCann tells how to complete our Coast Guard Patrol Boat
I HAVE transferred my allegiance from destroyers to the new 165-ft.U.S. Coast Guard patrol boats. Smart they have to be, not only in looks, but also in fact, because their rescue work is usually done when the elements are at their worst. There are no finer powerdriven craft than these Diesel-engined patrols.
ON SIMPLIFIED ship models, broom straws may be used for ratlines. Cut them longer than needed, enamel them black, and set in place while still sticky. They will adhere firmly to the shrouds and may be trimmed when dry. Lightly varnished straws may also be used for capstan bars and other parts that support no weight.
THE task of hanging up clothes on a laundry clothes tree or outdoor drier can be made considerably easier by constructing a simple revolving table and bracket for the basket and clothespin bag. The table, with a slight push, turns around the clothes post as the line above becomes filled, and not much bending has to be done.
EXHIBITIONS, dinners, outings, and other events brought to an end a successful and busy season for the majority of the clubs in the National Homeworkshop Guild. A few of the clubs are continuing their regular meetings through the summer.
HAVEN’T you often envied the friend whose mantelpiece or den is enhanced with a beautiful ship model? There is no need for envy, however, because you can build an attractive model of your own by obtaining one of our construction kits and following the blueprints and instructions.
CONCRETE is so easy to cast in wooden forms that it is an excellent material from which to construct substantial pieces of garden furniture and flagstone walks. Properly mixed, it will last indefinitely. In the accompanying drawings are suggestions for a bird bath, flowerpot, Roman bench, lily pool, flagstones, and fence posts.
FOR lapping bores of cylinders, sleeves, and similar parts, the work preferably should revolve, not the lap. Best results are obtained with a vertical set-up. Blue vitriol will give a copper coating to brass if a little cast-iron dust is applied to the surface.
YOU can double the pleasure you get out of your home workshop by using care in choosing good projects to make. Whenever you are in doubt as to what to build next, consult our blueprint list. Some of our most popular blueprints are listed below, but a complete list may be obtained by sending a self-addressed stamped envelope.
GRAPHITE HELPS TO PREVENT SCORING TAILSTOCK CENTER
ORDINARY sandpaper pads used by draftsmen do their work well enough, but the powdered lead must be jarred off, leaving some of it afloat in the air to smudge drawings, and such pads are especially objectionable for art students because of the charcoal dust that is spread around.
Three prize winning letters in POPULAR SCIENCE MONTHLY’S new Secrets of Success contest—“What Home Study Has Meant to Me”—are printed below. Read these stories carefully because your own career may be just as interesting and inspiring to other readers.
Home study is not entirely correspondence school work, although I have taken work that way and still do. A lot of my home study consists of sitting down in my easy chair in the evening with a good book (facts, not fiction) and reading about what is going on in the world . . . literature, science, travel and history.
Twenty years ago while working at the carpenter’s trade I had a serious accident. Fell off a scaffold through a plate glass window, severed all the arteries and leaders on the front of my wrist and came near bleeding to death. After several weeks in the hospital I came out with my right hand completely helpless.
It was during my first years of high school that I became interested in taxidermy and entomology. I started to collect specimens of animals and insects about four years ago but found that I ruined or mutilated many of them due to my inexperience.
BOX CONNECTORS FOR ELECTRIC WORK MADE FROM COUPLINGS
COUPLINGS may be used on steel-tubing electrical jobs if you run out of box connectors and it is inconvenient to replenish your supply. Unscrew one end, remove the “squeeze” collar, and insert the coupling body in the knockout hole in the outlet box or cabinet.
WALL BOARD USED IN PLACE OF EXTRA LARGE DRAWING BOARD
L. N. G
NEEDING a large drawing board and not having the time to get one, I obtained a sheet of composition wall board 3 by 5 ft., which came squared quite accurately. After it had served its purpose, I found it useful as a base on which to thumb tack large blueprints for easy examination.
STICK shellac in a large variety of transparent and opaque colors is sold by dealers in wood-finishing supplies for the purpose of patching cracks, holes, and other blemishes in furniture. The shellac is applied with a hot knife or small soldering iron, very much as if it were sealing wax.
AN ADDED touch to a nineteenth century naval ship model is the cutlasses which were usually hung under the poop deck in the break. These can be made of pins or thin wire. Cut them to scale length, bend a loop at one end, flatten one side to represent the guard, and PAINT.