Sir: The rocket taking off on page 124 of the September issue, called a V-2, is actually a Wac Corporal, which takes off with the aid of a booster rocket. The booster is indicated by the black, smoky flame characteristic of powder boosters.
MEET Richard Sinnott, age 18. He is a student at the El Cerrito High School in California. He is sitting at the unglamorous plywood control board of one of the most exciting machines ever devised by man. It is a baby cyclotron, put together by four El Cerrito students under the inspired leadership of their physics instructor, Ben Siegel (see p. 102).
Working high up in a regenerating unit is but one of the many nasty and hazardous jobs involved in the annual cleaning of a cat-cracker. These catalytic oil-processing units, operating 24 hours a day at temperatures around 1,000° F, take a terrific beating from erosion and corrosion.
Without pilots or engines, the Navy’s 600-mile-an-hour midgets report from the edge of the sonic barrier.
George H. Waltz
AB-17 drones steadily across the sky. Suddenly, from under its wing, a tiny plane drops into a steep dive. No propeller spins, no jet roars, but it screams down at 600 m.p.h. No pilot sits at the controls, but the midget pulls out of the dive and swings upward in a long curve.
PUTTING a hole in a liquid is tough enough, but the U. S. Steel Corp. Research Laboratory in Kearny, N. J., goes one better and punches the round hole above with a square peg. It’s part of a quenching operation to increase the wear resistance and hardness of steel.
THERE’S a new electric strongman in the steel mills—the fork and ram truck designed by B. I. Ulinski to lift and move heavy rails. In this demonstration, the automatic lift truck hoists a 45,000-lb. boxcar. It can handle loads from 10 to 30 tons.
Mass production of man-made “radium” provides a wonder tool to aid international research.
Alden P. Armagnac
A NEW era in medicine and technology began last September 5 when a lead-lined box containing radioactive phosphorus started by plane for Melbourne, Australia. Urgently needed to treat a patient with a blood disorder, it inaugurated world-wide distribution of man-made radioisotopes— “artificial radium” in layman’s language— from the chain-reacting uranium pile at Oak Ridge, Tennessee.
THIS “cannon” speeds track-laying by shooting holes in steel rails. Made by Mine Safety Appliance Co., the 45-pound gun uses a cartridge slightly larger than a .45 to blast a punch through ¾-inch steel. Tapping firing pin, at left above, sets it off. At right are (l. to r.) the gun, cartridge, barrel, punch, and breech; in foreground is a compressed-air ramrod. Punch—and resulting hole—can be up to 1½ inches in diameter.
THE Vee-D-X, a new long-distance antenna, makes television reception possible as far as 125 miles. It has high forward pickup, but little at sides and back, minimizing interference. Easily installed, it weighs 25 lb., has low wind resistance.
THESE full-size, luxurious cars are two of the four new British-made Austins that will make their debut in 1948. The “Sheerline” (top, below) has a 6-cylinder, 130-hp. engine; the “Princess” (bottom) boasts 10 hp. more and many special features.
GERMANS struggling to rebuild their shattered homes are going right back to Mother Earth. Dried mud blocks are being used for houses in a new settlement on a one-time drill field near Frankfort on Main. Twenty-six houses, each of four or five rooms and a basement, are to be completed this year.
Invisible network will handle phone calls, telegrams, television, FM and AM broadcasts, complete newspapers—even carry your mail.
COMMUNICATIONS are being revolutionized faster than you think. The humming wires beside the highways already are rivaled by new systems, capable of transmitting more spoken or written words and more still or moving pictures from coast to coast.
This 40-foot cone at Langley Field, Va., is the NACA’s device for testing performance of helicopter rotors without bothering to send them aloft. Instruments in the tower measure thrust and side forces, blade pitch, wind, engine r.p.m., and many other factors, while oscillographs record all data for analysis.
For transport to and from airports, the Miles M-68’s freight compartment turns into a trailer. The center of the fuselage is detachable (the four-engine British carrier flies with or without it) and has removable wheels and a towing bar.
This little atom smasher, designed by California high school students, works just like the big ones.
Andrew R. Boone
THE young nuclear physicist who won the Nobel prize by developing the cyclotron, Ernest O. Lawrence, started out with a little glass device that looked like a frying pan. Since then, cyclotrons have become such mammoth, complex, and expensive machines that the patent holders are rarely bothered by requests for licenses to build them.
WANT to build a factory? With these tiny models of machinery, you can set it up, change it around until perfect, and then translate the layout into floor plans— all at a fraction of the cost of ordinary, drawing-board planning methods. By combining stock parts with custom-tailored bases, the models are both accurate and inexpensive.
RESEMBLING a cluster of ice cubes, these are really seeds for telephone crystals. When lowered into a supersaturated solution of EDT—ethylene diamine tartrate—they will grow a crop of synthetic crystals. Developed by Bell engineers, these will replace natural but hard-to-get quartz in long-distance telephone circuits.
TRACKWALKERS of the Southern Pacific Railroad take no chances on missing any weaknesses in the rails they inspect. The device shown here has a mirror set at an angle at one end, enabling them to inspect the far side of the rails they patrol. Known as the Sands Rail Inspector, it is used in addition to periodic test by detector cars.
As TAP water passes through this faucet attachment, it is permeated by millions of air bubbles. The result is crystal-clear water that is splashless, softer, and better tasting. Called the Velva-Flo, the device is made by Firestone Industrial Products Co.
CLEAN areas of this subject’s face testify that even carbon black does not penetrate the filter of the American Optical Company’s new respirator. Chemical treatment of its fibers makes this filter 40 times more efficient than untreated ones.
LIKE a hidden microphone eavesdropping on a secret meeting, a new electronic analyzer for aircraft engines tells just what’s happening inside any cylinder of any engine at any time—in flight or on the ground. So accurate that it can spot a single misbehaving spark plug out of the 224 on some big air liners, the analyzer helps avert engine failures aloft and saves valuable hours for ground repair crews by telling them exactly what they’re looking for.
USING a water-dispersed emulsion of synthetic resin instead of the usual drying oils, a new paint that dries in half an hour is said to rival the appearance and durability of oil finishes. Its ability to withstand washing and scrubbing, in contrast to other water-mix paints, is illustrated in the two photographs at the right.
A BOON to drivers, an automatic lift gate installed on rear of this truck saves a lot of back-breaking work. Operated by power take-off from the truck engine, it facilitates the handling of heavy and bulky loads, thus speeding up delivery and pickup schedules.
ANOTHER new type of lift is this contraption that climbs up the side of a building to rescue persons trapped by fire. Called a “Mechanical Fly” by its inventor, W. J. Bernett, of Kansas City, Mo., it travels along the ground on rubber-tired wheels.
TRAIN operation under written orders is on the way out. Dispatching boards like the one shown below used by the Union Pacific permit centralized control of rail traffic. Through finger-tip manipulation of switches and block signals, dispatchers have continuous control over traffic along hundreds of miles of track.
WHILE production was under way for delivery of the first new Farmall cub tractors to America’s farmers, the International Harvester Co. also was tooling up on a pint-size toy version for Junior. The model, shown here being assembled, is a faithful reproduction of the McCormick-Deering Farmall, scaled down to 1/16 size.
TAKE a good look at the front cover of this issue of your Popular Science Monthly. You are looking at something you have never seen before—a picture that was transmitted by radio in one operation and imprinted on a sheet of ordinary paper. This is known as color facsimile. It is the product of years of effort to transmit an image by wire or radio and reproduce it perfectly on ordinary paper at the receiving point.
Rockers Lift Loads. Curved, rockerlike runners, extending downward from the sides of this novel hand truck, help lift heavy loads by allowing it to tip easily into a vertical position. Patented by John Donald, of Birmingham, England, the truck is turned up on end to receive the load, then pulled down again to raise it.
Research at White Sands is producing missiles too big and too powerful to be fired except with an ocean near by.
WHITE SANDS, the rocket proving ground in New Mexico that has launched dozens of German and American missiles on the trail of the secrets of outer space, is working itself out of a job. From research at this bright desert post are coming new rockets too powerful to be fired within its limited confines.
THE world’s largest water softening and filtering plant, at La Verne, Calif., turns six billion glassfuls of hard water into soft water daily. How it works illustrates the solution of an outstanding problem of everyday living. Hard water makes soap curds; it rings the bathtub; it soils laundry; it forms ruinous scale in the boilers of industrial plants—all because it contains dissolved limestone and other “hardness-forming” minerals, such as calcium and magnesium sulphates.
A sun lamp, an oven and a negative impress permanent pictures on metal particles in Corning’s photo-glass.
Alton L. Blakeslee
GLASS with a "memory” is the latest creation of the 6,000-year-old art of glassmaking. This wonder glass captures lifelike pictures, in colors, inside any object into which the glass is fashioned. There they are held forever safe from bending, scratching, fading or weathering—everything but outright breakage.
Mighty power of midget models, now becoming available, foreshadows era of new uses for jet power plants.
WILL gas turbines, new standard for military aircraft and the coming thing for civilian planes, drive automobiles next? High horsepower-to-weight ratio afforded by big jet engines interests automotive engineers in new and smaller power packages.
And when it was evening, His disciples came to Him, saying: This is a desert place . . . send the multitude away. . . . But Jesus said unto them: They need not depart, give them to eat. MATT, XIV: 15, 16. On Ascension Island, Army Air Forces base in the Atlantic Ocean, there was no soil at all, but a multitude was fed fresh vegetables from hydroponic gardens.
Heated Steering Wheel. To warm the hands of those who prefer to drive in winter without gloves, Mrs. John Hallacy, of Joplin, Mo., would like to see heating coils embedded in the steering wheel. R. R. Safety Signal. A second light of a different color to signal the approach of another train after one has already passed a crossing would reduce accidents, says George A. Budd, of Clearfield, Utah.
A MODEL playroom—a child’s dream world from floor to ceiling—has been designed by architect Joseph Aronson for the American Toy Institute, research division of Toy Manufacturers of U.S.A., Inc. The idea of the 12by 18-foot model room is to get the most out of maximum play area in minimum space in a way that the average home owner can duplicate, either in a whole room or in a corner of a bedroom. The model emphasizes elevated play areas and ample, easy-to-reach toy-storage space.
Improving Nazi Radar. The Army Signal Corps has big plans for this huge “Wurzburger” radar, built by the Germans. At the Evans Signal Laboratory, Belmar, N. J., the parabolic antenna will be replaced by an even larger one to shoot signals to the moon.
Wandering earrings will stay closer to home if you make your wife this "tree" for her dressing table. If she clips her earrings to the lucite leaves that sprout from the duralumin trunk, there's less chance one will be lost, and she’ll also find it easier to pick out just the right pair to go with her ensemble.
FOR the first time since the development of modern Chinese script more than 16 centuries ago, a way has been found to copy quickly all of the language’s thousands of complex characters. It is the unique “Mingkwai” (clear and quick) typewriter, invented by Lin Yutang, Chinese author.
YOU won’t be tossed around when you ride a train fitted with a new automatic “ride smoother.” You won’t feel the bumps. And your coffee will stay level in your cup even if the engineer takes a curve too fast. Automatic screw jacks will tilt the car’s body just enough to provide the right amount of bank.
A BRITISH inventor has come up with an aid to high-speed bricklaying that should help solve his country’s housing shortage. It is a metal guide that replaces the present length of line used to make sure that all angles of the wall are correct.
AT RIGHT is shown the comparative sizes of a wrist watch and the new miniature radio transceiver being developed by the U. S. Bureau of Standards. The set both sends and receives short waves and also picks up standard radio broadcasts. It was designed around the tiny radio tube, not much larger than a grain of rice, that is shown actual size in inset at lower left.
"IT IS now 12 o’clock noon. At two, a heavy thunder shower will soak the racetrack, but should end before the first race at 2:30. The storm will not hit the ball park or bathing beaches.” That is the kind of pin-point weather prediction Canadians may soon receive from a new system being developed by the Dominion’s Defense Research Board.
WITH special machines and a variety of soil samples, federal farm experts can reproduce almost any farm in the Southeast right in their own acre-sized back yard at Auburn, Ala. Here the U. S. D. A.’s Tillage Machinery Laboratory, one of the first of its kind, is learning just what happens when a farm implement slices through the soil.
WHEN the 7:30 whistle blows each morning at a cluster of grey shops just outside Baltimore the yard is packed with the makings of houses—steel joists, lumber, siding, shingles. By 11 o’clock the top layers of these piles have been built into four walls and a roof.
WHEN already overworked jets aren’t pushing airplanes, speedboats or racing cars, they are assigned to less glamorous jobs in Britain. On the River Thames, dredging experts are experimenting with an aircraft jet engine to blast away dock-blocking mudbanks.
Cap Has Pouring Spout. With these new plastic caps, a housewife can make her own canister set from ordinary canning jars. The cap includes a pouring spout which, when not in use, pushes down flush with the top. Made by Jiggs-Penny Corp., New York, the caps sell for 25 cents each.
Eliminates Drafts. Even though the front window of a car is wide open, a plastic device made by the NuWorld Products Company, Huntington Beach, Calif., deflects the wind outward, protecting rear-seat passengers from drafts. Installed inside the window by three clips, it does not interfere with normal window operation.
IF YOUR car should require new brake linings, there is a good chance that the mechanic may suggest bonding them to the shoes, for an increasing number of repair shops are offering such service. By this relatively new process, linings are cemented and heat-bonded on the shoes, eliminating the traditional rivets.
CAR doors are usually the first things to give trouble when a body begins to wear. They have to be slammed to stay shut. Hinges become sprung. Window glass will not raise and lower easily or far enough. Rattles distract the driver, and latches that hold doors insecurely invite injury to passengers or passers-by.
Anyone could see the fuel mixture was too rich–but why? Cleaning and adjusting the carburetor made no difference.
STAN HICKS nudged his employer, "Here’s Old Man Trouble himself!" he said. Gus Wilson looked up. The driver was just getting out of an old but well-kept sedan he’d stopped in the center of the Model Garage shop floor. His thin face was creased with chronic dissatisfaction.
FORMED from soft copper and given an antique finish, a set of these individual serving trays and matching mugs or cups makes a gift that should please any hostess. Make the tray mold or form of a 2" by 10" by 12" block of hardwood, carving or routing the recesses to a uniform depth of about ½".
WHEN an antique English folding table of the type called a “tuckaway” recently came into my hands, the method of construction and operation seemed so simple and effective that I decided to make a modern version. The original is styled in the Jacobean tradition. Such pieces may date anywhere from 1600 to 1800. Of heavy dark oak, the legs are identical turnings made into two gates by rectangular stretchers, notched into one another to fold compactly.
STANDING on a dressing table, this earring holder looks like a tiny bejeweled Christmas tree, and her ladyship is sure to forgive you for locking yourself in the workshop for the few nights that it will require to complete. To see it in full color, turn to page 136.
EQUIPPED with four electric motors, this control-line tank brings a remarkable note of realism to living-room war games in the home of Alfred J. Brosseau, of Cambridge, Mass., who spent a year and a half building it. Measuring 6" by 12", the model can imitate any action of its big brothers.
With hollow spars and stunsails for light airs, the Flying Cloud will outperform conventional box kites.
W. Mack Angus
HERE’S a kite that will win all honors in a breeze—or in practically still air, for that matter. It is called the Flying Cloud and, like that famous clipper ship, it performs superbly when the wind is up. In a good blow it uses just its working sails, but it can also set auxiliary studding sails, or “stunsails,” to sustain it in light air.
LOTS of action in a pull toy makes a hit with the kids. Here’s one that more than fills the bill, for the little white boat rocks and the fisherman pulls the fish out of the water as the toy is pulled along. Cut the top of the base from ¼" plywood, drilling a hole and starting the slot with a coping saw and finishing with a keyhole saw.
ILLUMINATED by a set of standard outdoor Christmas lights, this painted ornament will provide a cheerful decoration for your door during the holiday season. Its size may be varied to suit the door. Lay out and saw the tree and pot from outdoor plywood, composition board, or similar material.
OLD brass keys may be turned into attractive lapel ornaments or brooches. Such keys often are available for a few cents in secondhand stores. First, clean up and polish the brass. One way of doing this is to use a cloth buffing wheel charged with rouge.
IF YOU use a drill press only for making holes in wood or metal, you are not getting full value from the machine. A drill press is, in fact, a versatile tool well suited to a wide variety of operations that will speed up and make much easier numerous jobs around a shop.
It Burns Me Up to read about people who set fire to good mattresses by smoking in bed. But I like to smoke in bed. Not caring to burn up, I got the base of an old gooseneck desk lamp, a two-part cigarette holder, and some plastic tubing. The tubing runs through the lamp-cord holes in the base.
WHEN you pass the candy in this turned bonbon bowl, a Swiss music-box movement strikes up a tinkling tune. The music stops when the bowl is returned to the table. It’s shown in color on page 136. Mounted on a sounding board, the music movement is concealed in a space hollowed out of the base of the bowl.
BEFORE the snows come this winter, why not make this bobsled ready for the first fall? Carrying up to three persons, it’s sprung on all four runners to give a smooth ride whatever the speed. For the springs, select a pair of long main leaves from any light make of car at a wrecking yard.
Pontoons Stabilize Boat. An outrigger unit consisting of two pontoons on telescoping steel arms is made by the Lee-Neal Company, Minneapolis, Minn. The rubberized-fabric pontoons are easily inflated by mouth, and clamps attach the arms to the boat.
ALTHOUGH this bracelet has the heavy, massive appearance of the traditional slave type, it nevertheless is comfortable to wear because the hollow construction of the decorative balls makes it quite light. The body requires a 2" by 6½" piece of 18-ga.
METAL projects or objects already in use in the home may often be improved in appearance by finishing the metal in various effects and patterns. An electric drill or drill press and a few simple accessories are all the equipment needed for such work.
A THREADED jar ring clamps the pad of steel wool used in this efficient polishing head. For the pad assembly, turn two disks from ¾" plywood, one 2¾" in diameter and the other 2". Hollow the face of the larger to allow space for the steel-wool pad.
GUIDED by the pin, this drill-press cutter follows an edge on irregular work, beveling as it goes. It was mothered by necessity while I was making brass escutcheon plates. The cutter may be made from a 1" length of ¼" or 5/16" drill rod. Chuck in the lathe and drill a hole one size smaller than the drill shank you intend to use as the pin.
PEPPERCORNS, the hard little seeds from which fresh, pungent pepper is obtained, can be ground directly over your plate with this traditional table mill. Mount a 2¼" maple turning square on the screw center, support it with the dead center, and rough-turn the outside.
STURDY and decorative, this stool offers an excellent one-evening project. If necessary, it may be built entirely with hand tools. All pieces are cut from 1" stock. Shape the two endpieces to the freehand curves shown with a coping saw, making them about 12" long.
THE magic Hilsch tube that imitates Maxwell’s imaginary demon by blowing hot and cold at the same time (PSM, May '47, p. 144) can be made at your own workbench and operated at the nearest gas station. A simplified version was designed for Popular Science readers at the RCA Transmitter Laboratory, Rocky Point, N. Y., where research on this curiosity of thermodynamics goes on.
Milling on a Lathe. Precision boring and milling can be performed on virtually any small machine lathe with a new adapter being manufactured by the Qualified Gage Company, of Berkley, Mich. Providing for both horizontal and vertical movement of the work, the adapter consists of two main parts.
Cutting a Blind Slot. Where no great precision is called for and the work will tolerate bending, slots can be cut much faster with a hacksaw than by drilling and filing. Simply bend the piece as above. To remove the waste strip, use a chisel or drill a hole at each end.
Lure Holds Live Bait. Imagine the surprise of a fish that comes to this lure. The minnow is alive, but is protected inside a transparent plastic casing that magnifies it to appetizing proportions. Made by the Rice Engineering Co., Detroit, Mich., the lure has two triple hooks and a removable head to permit insertion of the bait.
the Rice Engineering Co.
Plane Made of Magnesium. Built of magnesium, this model plane has the lightness of wood with far greater strength. It is furnished in kit form by Rokwell Industries, Inc., of Clayton, Mo. Wing, fuselage, and control surface sections are preformed.
the Rice Engineering Co.
Speed Changer Aids Hobbyists. Designed to increase or decrease shaft speeds in small power devices, this miniature gear box is available in various gear ratios. Built by the Metron Instrument Company, Denver, Colo., it has concentric drive shafts mounted in ball bearings. Power passes from the input shaft through spur gears to a countershaft, thence through another set of gears to the output shaft. Intermediate gears run in graphitic plastic bearings. The price runs from $16 to $18.50, depending on the ratio.
the Rice Engineering Co.
You Needn’t Yell "Fore". Firmly tethered to a stake driven into the ground, this golf ball never gets away. You just step up, smack it, and let it swing—but better keep out of the way. Manufactured by the Prac-Tee Company, Dayton, Ohio, the outfit is designed for backyard practice. It retails for around $3.50.
the Rice Engineering Co.
Carbon Dioxide Runs Engine. Standard carbon dioxide cartridges power a model airplane engine produced by the Herkimer Tool and Model Works, Inc., of New York. Weighing less than ¾ oz., the engine has a finned steel cylinder, can be adjusted to run up to 60 sec. on a charge, and swings a 7" propeller with ease. It’s suitable for model planes up to 140 sq. in. wing area. The engine sells for about $7.50.
WITH this water-driven agitator, you can avoid the tedious job of agitating a roll-film tank by hand. A revolving crank on the water wheel moves a metal arm, bolted to the tank knob, back and forth through an arc by a pivoted linkage. Solder a can upside down against the side of another large enough to hold the tank.
WHETHER the focusing screen of a single-lens reflex camera is accurate may be checked by placing the camera about 36" from an ink-lined cardboard sheet, stopping the lens down to f/8, and installing a back focusing screen in the exact film plane.
HOW often have you sighed over those fast-action shots that weren’t quite fast enough? How many times have ordinary synchronized flash and a shutter speed of 1/500 proved sluggish when the negative was developed? Well, you can capture the briefest part of a movement and get fine, clear detail of people or objects no matter how rapidly they may be shifting.
Diffusers Snap On. Made of a nonwoven, plasticlike material, this diffuser has a strong elastic edge that permits it to be quickly snapped on or off the reflector. When not in use, it can be crumpled into small space and stuffed into the pocket or camera case.
Originated in Scotland, these new Stewartry copying attachments are distributed in the United States by Caprod, Ltd., of New York. Designed for use with Leica, Contax, and cameras of similar type, the attachments include a clamping arm, a focusing screen, and various extension tubes for work at close range.
BEFORE you start to build your own multitester, look over the fundamental data on the relationship between volts, ohms, and amperes given in the previous installment. With this information you can design a meter for any special purpose, adapt spare parts to suit your circuit, or build a general-utility multimeter for radio and electrical checking.
'Scope Tubes Plug In. Removing the light shield on the face of this new RCA oscilloscope permits quick interchange of the cathode-ray tube through the front panel. Tubes with different degrees of phosphor persistence may be switched in a matter of seconds, thus giving the single oscilloscope greater versatility.
EVERYONE in the family will enjoy this little two-tube headphone set. Junior can listen to all the programs especially meant for him, and Pop and Mom will escape the nerve-shattering tommy guns and thundering herds. Pretuning makes things easy, for any young listener can turn on the switch and set the pointer knob to his choice of three stations.
PHYSICAL abuse is a frequent cause of crystal-pickup failure. This may be avoided by installing a permanent-needle type of cartridge with a guard or by building a guard for your present pickup. An effective guard may be made from a ½" by 1¼" strip of shim brass .005" thick.
CONSIDERABLE time may be saved and possible errors eliminated by using price tags to mark the wires when making replacement of radio parts. During reassembly, the tags will show exactly where each wire goes. By erasing the pencil marks, the tags may be used many times.
Wagon Like Dad’s. This coaster wagon, built by A. R. Barringer, of Ruthven, Iowa, for his children, is patterned after an actual farm trailer. Aside from a few bolts, the running gear was made from pieces of scrap iron. Radius rods cut from a model T Ford serve the same purpose on the wagon.
Center of Oscillation. If you weight a curtain rod by winding wire around it near one end, will it be easier to balance vertically with the weighted end at the top or at the bottom? If you say the bottom, you are wrong. Although it is true that an object is more stable when its center of gravity is near the bottom, another factor comes into play in this case.
VARIOUS uses may be found for a discarded bandsaw blade ground to a knife edge. It is particularly good for cutting such materials as sponge rubber and cork. For grinding, mount the blade on the saw, taking care that it is adequately tensioned and tracks properly. Any grinding wheel from ¾" to 1" wide that can be set on the table will do. Mount it to grind a bevel of approximately 10 deg. on each side of the blade.
HERE are two homemade gadgets that I have used for many years in my work as a plumber. They should also prove useful around the home when the need arises. The first is a basin overflow stop. When it is desired to use a plunger pump to clear a drain, the T-head of the bolt is inserted in the overflow opening, given a quarter turn, and the wing nut is then screwed against the brass plate.
THERE are no springs on this small swinging door for a dog house, yet it always returns to the closed position after the dog passes in or out. The secret lies in the fact that the upper pin is ½" farther from the edge of the door than the lower pin.
PLASTICS require procedures quite unlike those used for other materials employed by craftsmen. How many mistakes can you spot here? There are three in storing, three in assembling, one in sanding, two in polishing. Check with the answers printed upside down below.
Music has charms to soothe the savage breast—particularly in the morning. Hence, I start my day with a soothing melody. Each night, I wind my phonograph and rest the tone arm on a favorite record. Then I slip a sewing needle under the felt of the turntable, slip over it a paper clip tied to a piece of string, tie the string to the wind key of a silenced alarm clock, tie a second clip to another string, slip it over the starting lever, and tie this string also to the wind key.
NEXT to sodium chloride (common table salt), sodium carbonate is the most widely used of all sodium compounds. More than 1,500,000 tons are consumed yearly in the United States as the starting point for compounding other sodium chemicals.
BESIDES holding its quota of cans, jars, and bottles, this handy kitchen cabinet has a tilting vegetable bin that can be opened or shut with one hand, stays in either position, and lifts out for cleaning. The cupboard shown was built from part of an old bookcase.
IF A plug must be detached from a wall socket when an electrical appliance is not in use, this clip will make it unnecessary to stoop down each time you want to use the appliance. Notch a piece of metal to receive the cord, bend to a 90-degree angle, drill a hole, and mount on the socket plate by the plate screw.
PLASTIC composition wood bought in cans usually dries out no matter how tightly the top is pressed on. As a solution, I now store the can inside a large-mouth glass jar with a screw top, turning down the top against a gasket made from oiled paper.
TEST tubes that have broken near the top may be returned to use by the method illustrated below. First, heat the jagged edges and flare them out by pressing with the leather-punch blade of an old jackknife or a similar instrument. After this, heat each sharp point to an orange color and trim off with an old pair of scissors.
ANY T-square can be converted into a parallel ruler with the attachment illustrated at the right. It also allows a draftsman to have both hands free, for the T-square is held firmly against the board. It may be made from light wood, metal, or plastic, the dimensions being suited to the thickness and width of the particular T-square.
THE coal range in the kitchen of our country house did not draw well, probably because the chimney is a bit too low. Some sort of forced-draft system was obviously the answer, but since the house is not electrified and I couldn’t locate a satisfactory 6-volt blower, I was stumped for a time.
ON THE beautiful hands of a woman or in the skilled hands of a man, nail polish can be one of the most useful as well as decorative of household items. In addition to the colorless variety and the myriad shades of red, it comes in blue, green, and other colors.
Grain Unloaded by Power. Designed to fit all 38" wagon beds, an unloader made by Piper-Odell, of Princeton, Ill., includes a V-type false bottom with an auger running its entire length. A direct drive from the tractor power take-off turns this augur, which in turn drives another auger in the elevator tube.