Sir: I would like your permission to make about thirty photostatic copies of the article “Danger 115 Volts,” which appears on pages 186 to 189 of the January issue of POPULAR SCIENCE. These copies would be for distribution among employees in our electrical department as part of our safety program.
CAN you tell by looking at this man whether he is a machinist or a scientist? Whatever you say, you will be right—because this man is both! He went to work for General Electric back in ’22 as a drill-press operator. His first job in the Research Lab was as a machinist.
This picture—uninteresting at first glance—is one of the most important photographs ever taken: the first published portrait of a ray of light stopped in its tracks. Each white dot is the reflection of the same beam of light in one of a series of mirrors spaced along an inclined board (inset).
America's foremost authority on strategic air power tells how amazingly bombing has changed since World War II.
How Far Could Our Bombers Go?
Engines vs. Distance
IT TOOK the United States and its allies a long time to bomb the will and ability to fight out of Germany and Japan. Tens of thousands of planes and advanced bases all over the world were needed. You’ll never see anything like that again. A few hundred planes will suffice the next time.
Jack Aids Blowouts, Skids. A small wheel in the bottom of this built-in, hydraulic auto jack is designed to act as a temporary support when a blowout occurs. When the jack is lowered further, the wheel recesses into the base, and the car is raised for easy tire-changing.
MOTORISTS aren’t the only ones to worry about flat tires. Locomotives get them too. Their great driving wheels scream against the rails in starting, braking, and grinding around curves until flat spots develop. That’s why railroad men are interested in this new method of shaving them smooth again.
Longer Hull, Safer Landing. The Martin XP5M-1 flying boat shown above will put to test a new, long afterbody hull. Extended to the extreme end of the plane, this is expected to permit safer landings in rough seas with less pitching and bouncing.
GOLF pro Joe Mozel has used his head to save his back—and the backs of all the duffers who spend hours just hitting balls for practice. He has invented a machine that automatically tees up golf balls, relieving practicing golfers of the bend-over-and-put-another-ball-on-the-tee routine.
WHEN the Giants go on the road these days, New York’s Polo Grounds does not lapse into its usual sleepy emptiness. Instead, 200 workmen bustle out—and soon the park echoes to the roar of motors. The midgets have moved in. For a new demountable, board track has made it possible to change a ball park into an auto race track in just 18 hours.
PEOPLE have been smacking their lips over ice cream for centuries, but nobody thought of coating it with chocolate and putting a wooden handle on it until about 25 years ago. Now hundreds of millions of pieces of ice-cream-on-a-stick are made— and eaten—every year.
Trapping Cosmic Rays. The two pictures above show the start of an expedition to capture cosmic rays—those tiny particles, smaller than atoms, that constantly rain down on the earth from outer space (PS, July ’48, p. 139). At left, scientists of the Massachusetts Institute of Technology set their trap, a ray counter and a radio transmitter.
DRIVING up to the service entrance of a garage that opened recently in Hartford, Conn., a new customer is surprised to see its massive door lift up before he has so much as sounded his horn. That’s only his introduction to a wonderland of mechanical efficiency that is no more like your corner service station than the Mayo Clinic is like a country doctor’s office.
THIS one-man, mobile Tournacrane carries a 7-ton load and turns on a 20-foot dime. The boom rides up and down on an elevator track, providing a 31-foot reach when fully extended. The track tilts backward to a horizontal position, and can be tipped forward to bring the load over wheels for better weight distribution.
INVALID patients get a lift—literally—with this Porta-Lift for home or hospital use. One person operating the hydraulic jack at the side can lift a patient into or out of beds, wheelchairs, or automobiles. A seat hanging from an arm at the top of the wheeled stand supports the patient in either a sitting or reclining position.
AN ENDLESS stream of high-speed, steel shuttles replaces the usual single, wooden shuttle in this new Swiss-designed weaving machine. Made by Warner and Swasey, the “rapid-fire” loom has nearly three times the cloth output of ordinary machines.
THIS versatile box, shaped to fit a car seat, can do four jobs for a motorist. Closed, it serves as a picnic-lunch box and at the same time as an arm rest for the driver or an elevated seat for Junior. Opened, as above, the hinged cover reveals a vanity mirror that swivels to any angle.
THIS cross between a deck-chair and a rocker lets you lean back and put your feet on the desk—without a desk. Thanks to the angle in the bottom rails, it can either be used semi-upright or tilted ’wav back, as above. Called the Barwa the chair is said to be scientifically shaped to the natural contour of spine and legs in relaxation.
THE new camp stove shown above takes little more room in a sportsman’s pocket than a fishing reel or a box of shotgun shells. When folded (inset) the Taykit measures only 5 by 4½ by 1⅞ in. Set up, with the carrying-case walls pushed out as wind-shields under two sides of a wire grill, it’s big enough for a frying pan, a coffee pot, or a four-quart kettle.
MAKING a suit of clothes really fit a modern man’s bulges, slopes, and protrusions is difficult craftwork. But engineering, physics, and optics have been combined now in a Photo-Metric process to help both tailors and their customers.
WHEN the giant “jaw” at the right snaps shut, it swallows 30 railway cars. It’s the upper bow section on the Danish ferryboat Fyn (above), which carries railroad cars on the 15-mile run between Nyborg and Korsor. Rising like a drawbridge, the bow permits railroad cars to roll directly from tracks on the dock to tracks on the ferry’s deck.
THE water itself does the work in this self-closing Paul valve for water hoses. The opening into the nozzle is smaller than the valve chamber, so the water must speed up to get through, causing a drop in pressure at the opening. This forces a ball inward against the opening, shutting off the water until the plunger on top is pressed down, pushing the ball away from the opening.
LESS than four inches long and only an eighth of an inch thick, this tiny mechanical lead pencil can be worn as a tie clasp. Made by the Slencil Co., of Orange, Mass., it has a long, spring-wire clip on the back that fastens the tie to the shirt. The lead is propelled or retracted by a single knurled roller recessed in a slot in the center of the pencil.
WANT an easy shoe shine? The Groomaster will meet you half way. Just put on the polish, slip your foot under the whirling buffer, and this portable home shoe-shining machine will do the rest. The eight-inch electric sheepskin buffer works the wax in and polishes at the same time.
New to United States, this European juice box will not crack, freeze, spill acid, or run down when left idle.
LEAD-ACID BATTERY NOW USED IN AUTOMOBILES
HOW NICKEL-CADMIUM AND LEED-ACID BATTERIES WORK
How It Was Born
One Step Beyond Edison
Inventor’s Son Comes to U. S.
Signal Corps Trying It
ONE of the greatest headaches of the American driver is his automobile battery. If left untended in storage, it grows green whiskers and dies; if it gets low in sub-zero weather, it is liable to freeze and crack. Jolting on rough roads may break its hard-rubber case, and without frequent drinks of water it ceases to function.
THIS gigantic hydraulic press takes whole auto bodies and in one motion crushes them into neat, bite-size morsels for the scrap-hungry mouths of southern California steel furnaces. Designed to speed the salvage of scrap metal, the huge crusher (above) is six feet wide, five feet deep, and 16½ feet long.
ENTIRE walls or partitions of glass can be easily assembled by simply fitting together these interlocking, double-pane blocks. Called Temprex Duo-Pane, they each consist of two 20-inch-square panes mounted 3⅞ inches apart on a structural aluminum frame.
HERE’S a toy train that kids can actually climb aboard and ride in. A San Fernando, Calif., manufacturer built it for his two sons. They liked it so well that his company, Bowlus-Robertson, is producing more like it for sale. Price: about $1,400.
Everybody has his own pet idea of some gadget he would like to see in general use. What is YOURS? Popular Science will pay $5.00 for each one published. Use government postcards only. Contributions cannot be acknowledged or returned. Transparent fuel lines.
Super-craftsmen at a Cleveland museum are translating health into push buttons—and visitors do the pushing.
Learning By Doing
George H. Waltz, Jr.
IN A small, well-equipped workshop just off one of Cleveland’s busiest streets, carpenters, artists, and technicians are making health visible. Their shop is part of the famous Cleveland Health Museum. Their job is building unique exhibits for the public to play with—and learn with.
LAST fall, 15 men bailed out of a disabled B-17 over the dense wilderness of the Nicaraguan jungle. Search parties brought out 14, but the last survivor was so badly injured he couldn’t be moved. Then a doctor of the USAF’s Air Rescue Service, Capt.
ALLIS-CHALMERS has put the cart before the horse in this new farm tractor. Placing the engine behind the seat and mounting implements under the driver, between the front and rear wheels, give him a clear view of his work and make possible the precision tillage needed for truck farming.
WHEN a doctor gives you an X-ray examination with a conventional fluoroscope, he sees a dim, greenish-yellow-and-black image on the viewing screen. It is so faint that making out fine details of your internal organs in action is like trying to read a newspaper by moonlight.
A NEW electronic tube no bigger than a walnut can measure the slightest movement of objects as small as the hairspring of a watch. The object over which it “stands guard” must first be magnetized or have a magnet attached to it, as in the sketch at right.
BILL BURKE is an Alhambra, Calif., welder; Don Francisco, a city fireman. They’re not sure just what their car is: it has the chassis and running gear of a Ford roadster, a Mercury engine, and a body made from the wing tank of a P-38 fighter plane.
WHAT new automobile has a T-shaped piece of chrome on its grille? If you’ve kept up with car styles, that’s a feature you’ll look for in identifying one 1948 model. Here are front-end views of 12 new cars. By this time, you have seen them all. How many do you recognize?
THIS lightweight German pile driver, now in use at the U. S. Navy’s Port Hueneme Proving Ground, Calif., is its own engine. Weighing only a ton, it is essentially a single-cylinder Diesel engine, with the 1,100pound hammer acting as a piston.
HAVE a fevered brow you want cooled? Or a tummy ache you want warmed? Either one is possible with this combination ice pack and hot-water bottle. Called Hot-R-Cold Pak it is a folding, wallet-size, plastic pouch containing a special liquid that stays either hot or cold for a long time.
SEEING triple? That’s just what engineers at Sylvania Electric want to see when they study the light patterns of lens-type lamps whose beams are too broad for screen projection. They place an opal-glass globe over the lamp to be tested and then put mirrors behind it on both sides.
No, THIS isn’t a new creation in ladies’ hats—it’s Bell Telephone Laboratories’ latest gadget for getting the head sizes of its telephone operators. The graduated rods around the semicircular headpiece produce accurate contour maps of any head shapes.
CURRENTS as small as a billionth of an ampere can be measured with a new RCA microammeter, shown above, designed for such ultra-sensitive jobs as gauging the light emitted by stars. The portable instrument covers the range from a billionth to a thousandth of an ampere.
You won’t see a truck on the road with quite as many rear lights as this one has. Thanks to it, however, “stop” and “turn” signals on other trucks may be improved. General Electric designed the panel to test lights of various colors and brightness.
HOLES too small to be measured with ordinary tools can now be gauged with this British device that shoots compressed air through them. The instrument actually measures how much an electric filament is cooled by an air stream escaping through the test hole.
Short-range predictions based on a new discovery enable the world’s radio stations to counter magnetic storms.
Alden P. Armagnac
FROM an office-building rooftop amid New York’s downtown skyscrapers, J. H. Nelson, radio engineer and official sunspot observer for RCA Communications, Inc., scans the solar disk daily through a six-inch telescope. Making penciled dots on a circular chart, he carefully notes the position of blemishes upon the sun’s face.
USING the self-propelled barge and the photoflash-bulb rig shown below, Navy photographers are studying a submarine dust bowl—Lake Mead, backed up by Boulder Dam on the Colorado River. Photos taken with underwater cameras show them how fast the silt dumped there by incoming water, an estimated 1,400 carloads daily, is robbing the reservoir of water-storage capacity.
DOZENS of inventors have wrestled with the problem of devising a typewriter to write music. None so far has come up with a solution simple enough to displace the pen-and-ink hand method still used by commercial publishers. Failure by others, however, hasn’t daunted Dr. Floyd Fire-stone, Washington acoustical engineer, who has invented the music typewriter pictured at the top of this page.
ALIGNING a car’s front wheels is a precision job. The best way to see whether they’re exactly right is to measure how they behave when spinning at road speed with the car’s weight on them. A device that does this in 20 seconds has been developed by the Ford Motor Co. and installed as the last stop on assembly lines now turning out its ’49 models.
ICED windshields may seem no problem as yet, but with an eye to winter, Libbey-Owens-Ford Glass Co. is developing electrically heated ones. Perfected for war use, the safety-glass sandwich has an almost invisible film of stannic oxide on an inside surface.
AN UNUSUAL feature of this 500-lb. racer is the front spring assembly, giving knee action through an overhead transverse spring from which the chassis is slung. The car, built by the Monaco Motor and Engineering. Co., Watford, England, has a wheel base of only 5'.
AN AMBER dash light flashes on when engine oil drops 1 qt. below normal with this device. If the oil level drops 2 qt., a red light shines. Operating by the weight or head of oil in the crankcase on a resilient diaphragm, the Oil-Dicator consists of a unit that replaces the oil drain plug and a dash fitting.
Make Your Own Polishing Pad. If you own an electric drill, it’s a simple job to assemble a polishing attachment. Cut a 5" disk from ½" plywood, drill and counterbore it, and attach a shaft cut from a ¼" bolt. Pad the face with several layers of flannel.
When Stan Hicks graduates to a full-fledged mechanic and a new grease monkey comes to the Model Garage, time hangs heavy on extra hands.
“HEY, mister—what should I do now?” Gus Wilson, flat on his back under the jacked-up rear end of George Knowles’s car, looked up at Greg Jones, the Model Garage’s new grease monkey. “Well,” he suggested, “you might sweep out the shop.” “I’ve done that,” Greg told him.
STRIPPED down to serve as a trailer, the old auto chassis above still has its hydraulic brakes but they’re now applied by vacuum instead of by foot pressure. The intake manifold of the towing car provides the vacuum. A vacuum-line connector designed for trailer trucks allows quick coupling or uncoupling of the trailer.
HERE’S a simple timing light that will help you check and adjust the setting of distributor points. It also serves as a handy trouble light. It was made by soldering the socket of a single-contact parking-light bulb to the pivoting end of a storage battery clip.
DESIGNED especially for use in passenger vehicles, this gas turbine is now undergoing tests in England. Adapted from aircraft gas turbines, it weighs only 300 lb., develops 160 hp., and burns almost any oil as fuel. The British designers have given no hint, however, whether it overcomes two problems encountered by other experimenters—objectionable exhaust blast and excessive fuel consumption (PS, Nov. ’47, p. 128).
ROLLED along a map to follow curved highways or irregular small-boat courses, this measurer gives you the distance in inches that it’s moved. Changing inches to miles is then just a quick calculation with the inch scale on the map. You could, of course, calibrate the gadget to read distance directly, on maps of the same scale.
THE most important consideration in building this sliding-top coffee table is exactness. Accurate cutting and fitting are musts. In the currently popular light maple or birch, this piece is an asset to any room. Sugar, cream, and sandwiches may be served from the compartment with cups and saucers on the extended leaves.
A RUBBER doorstop, which can be purchased for about a dime, makes a handy rack for a pipe, as shown at the right. The stop may be used alone as a pipe rest, or it and an ash tray may be screwed to a wooden base.—H. Klein, Pittsburgh, Pa.
HERE’S another prehistoric horror, scaled down to a safe 3½" and mounted to decorate a letter rack. This big lizard—a stegosaurus—was an early dinosaur. He exceeded a modern elephant in bulk. To give you an idea of his size, the largest of the spiny fins on his back was 3' high.
NEXT time you want to drill a hole in a spot where there is barely enough room to move a hand, try winding a few feet of stout string around a pin vise. You’ll also need a pad or button with a short shank to fit loosely into the hollow vise body. Apply pressure on the button as shown and pull the string.
HERE’S what you need to make this lightweight, picnic refrigerator: A canvas beach bag, an ice bag, a pound roll of nonsterile cotton, and a plastic-film table-cloth cover. Make paper patterns of the end, side, and bottom of the beach bag, cutting them about I" larger all around.
With dyed flock, you can give any surface a colorful, velvety finish.
PHONOGRAPH turntables aren’t naturally fur-bearing. That velvetlike surface on them is a finish called flock. It consists of tiny bits of fiber—some 250,000 to a square inch—standing on end in a coating of adhesive. Flock finishing is now within the reach of any craftsman.
AN EMPTY ball pen or cartridge—the type with the ball built in—is worth keeping as a smooth-acting, round-point stylus. Craftsmen can emboss leather or metal foil with it, as above. It’s also fine for drawing on duplicating stencils. Used with carbon paper, it makes dark, clear copies without smudging the original lines as a pencil will.
A KEEN, durable chisel, especially good for tree surgery, may be made from a broken auto spring leaf. Grind the broken end to the desired shape. Then in a forge or furnace soften the metal for blacksmithing into a gouge contour. At the other end of the spring section, roll the edges together to form a suitable shank for hammering.
DID YOU ever hesitate to buy a magazine as you rushed for a train because you already had your hands full with bags and a coat? A large Manila envelope, taped to the side of your bag, makes a fine emergency carrier for a book or magazine. You can buy the envelope in any stationery store.
AN EXTENSION cord set with an unbreakable, three-way plug and attachment plug of soft rubber has been announced by the United States Rubber Company. Intended for general household use, the set is produced in lengths of 6', 9', and 15' of No. 18 rubber-insulated wire.
WORM holes add an authentic air to antique copies. A discarded dentist’s burr, in a chuck turning at 3,500 r.p.m. or faster, will produce realistic ones. Vary depth and direction as shown.—Reginald O. Lissaman, Brandon, Man.
Two things that go together like ham and eggs are a typewriter and a wastebasket. Whether you’re a professional writer or whether you just use your typewriter for occasional correspondence, you’ll still need a wastebasket nearby. The combination pictured above is another practical solution devised by the Editor for his own use.
WITH an electric engraving tool of the vibrator type you can thumb-index phone books, catalogs, and other volumes. Decide how many notches are required. Then measure the long edge and divide it for the needed number. Cut the notches in the pages preceding each letter.
Pulse jets find increased favor with modelers as experimenters work bugs out of war-developed power plants.
J. H. Lemelseon
R. F. Probstein
MODEL builders are switching to jets. In increasing numbers, enthusiasts are fitting miniature planes, boats, and racing cars with small jet engines—the same type that powered the Nazi buzz bombs, These little power plants measure less than 2' long and are from 2" to 3" in diameter.
KNICKKNACKS, especially glass objects, are displayed effectively on this fluorescent-lighted shelf. The dimensions in the drawing are for a 14-watt lamp. However, by simply increasing the length, a 15-or 20-watt lamp may be used. The stock is ⅜" white pine.
Eliminate tedious trimmning close to a fence by keeping long, narrow boards under it to stop the growth of grass there. Replace them after using the lawn mower. Brackets for this small kitchen shelf are cut from a single wooden coat hanger. The top is a piece of ¼" plywood. Drill holes for screws and for the dowel and finish with enamel.
Squeezer Is Mixer Too. The Juice-A-Shake combines squeezing, straining, and shaking in one compact unit. It may be used to make orange juice, milk shakes, or cocktails. Eggs also may be prepared for scrambling or cream whipped in the three-piece plastic juicer.
AN ASHTRAY, table lighter, and double-decked candy dish make up this different and attractive cocktail threesome. To construct them you’ll need a lathe, a hand grinder, and some old china ware. I used two plates of different diameters, a sauce dish, and a saltcellar.
STOCK cards used by stamp collectors can be made up from file cards and 1" transparent mending tape. Cellulose tapes that stick without wetting are harder to use. For each pocket, cut a strip of tape the width of the card. Score it with a pin or knife point as shown and fold along the scored line.
At last I know when to empty the ice-box pan. I rigged a doorbell and a dry cell and placed the ends of the wires just below the rim of the pan. When the water reaches the wires, the bell rings. A dollop of salt in the water helps conductivity.—Leslie Graves, Livingston Manor, N. Y.
WHEN an outboard motor is not in use, it is best to store it in an upright position. A stand on casters is ideal for this. The motor is held securely yet it is accessible from all angles for cleaning, lubricating, or overhaul work. Random widths of ¾" pine were used to build the stand pictured above.
A SPONGE-RUBBER ball cut in half will solve the problem of a leak at the pole spike of a tent. Force a half of the ball over each spike, as shown in the sketch, so it will rest lightly against the canvas. Even if the spike projects through the ball, the soft rubber makes a seal around it.
THIS cutter for roofing and building paper is made of four 40" pieces of crating material. Space each pair of slats about ½" apart with a cleat at each end. Hinge one end as illustrated. Attach a steel wire at the other end. To cut, place the paper as shown, close the frame, and pull the wire.
A DISCARDED lipstick tube makes a dust-tight holder for a draftsman’s eraser. First clean any remaining lipstick from the holder. Then select a good-quality eraser and, with a razor blade, whittle it to snugly in the retractable section of the tube.
A HALF century ago neighbors referred to Ernest Warther as “that boy who whittles.” Today, at 63, Mr. Warther still is whittling. Carving scale models of locomotives is a full-time business with him now. His models, tracing the evolution of transportation on rails, reflect the skill and patience of a master craftsman.
Care is the principal ingredient of well-out circles and holes, hut these tips on technique may also help.
Marking the Centerline
Sawing a Circle
Smoothing the Edge
Boring a Hole
Keeping Bits Sharp
Edwin M. Lore
FLAT surfaces and square edges are the bedrock of woodworking craftsmanship. But like the human skeleton or the framework of a building, they frequently gain in beauty by being concealed or covered. Previous articles in this series discussed the uses of bevels, chamfers, and recesses in relieving the monotony of squared edges.
Brazing Kit Has Heat Chamber. Offered by the American Products Corp., Chicago, this compact outfit contains all necessary materials and equipment for light bench brazing. The heat-retaining chamber, pinned together of asbestos board, permits handling fair-sized jobs with a small torch.
ALTHOUGH only about the size of a penknife, this folding screwdriver is rugged enough for really heavy work. The blade is sandwiched between two pieces of tapered steel that may be used as blades themselves. With a hacksaw, thin abrasive disk, or slitting saw in a milling machine, split lengthwise a 4" piece of ½" drill rod.
Mill Makes Screws. Modelmakers and others who occasionally have to make up a few special screws will find hollow end mills a great convenience. They are particularly useful in making small screws— 4-40, 3-48, 2-56, and the like. To make a mill, chuck a length of drill rod, face, and centerdrill the end.
A SET of hollow punches, besides Being a useful addition to any shop, is an interesting lathe project. The tools are used for cutting neat holes in many materials from thin sheet metals to leather and paper. The most commonly used raw stock is tool-steel rod that can be hardened and tempered by heat treatment.
OWNERS of duplicating machines or small print shops without commercial stapling machines will find this inexpensive setup satisfactory for folders and booklets. Alter a hand stapler as shown, retaining the anvil. Solder the anvil in a recess cut in the 45-deg. angle iron.
HERE’S a blind bolt for attaching parts to walls, pipes, or other spots where both ends of a bolt are not accessible. Notch an appropriate length of copper tubing as shown. Insert from the notched end a slightly longer bolt with a head about the same diameter as the outside of the tube.
This sweat-saving shop tool will put cobwebs on your hacksaw. It’ll chew through almost anything you feed it.
IF YOU’VE recently muscled your way through a big chunk of metal with a hacksaw, you’ll appreciate this cut-off wheel. The thin abrasive disk will chew its way through angle stock or pipe in a matter of seconds, leaving a smooth cut. In our shop we’ve also used it to trim flowerpots, cut armored cable, rough out radio panels and chassis, and whack off extra metal from castings.
THIS low-slung, comfortable swing seat will make any shady spot on a lawn or porch more inviting. It’s simple enough to be built in a home workshop equipped with a circular saw; a bandsaw or jigsaw for cutting the contoured slats will also help.
IF YOU’RE thinking of buying or building a boat for car-top carrying, here’s a word of caution. You can carry any boat that’s light enough for easy handling, but unless it’s designed especially for such use you’ll probably come out on the short end of the deal.
It’s equipped with condensers and handles any negative up to 2¼" by 2¼".Gear focusing gives vernier sharpness.
Leonard J. Bogert
FOCUSED with a rack-and-pinion adjustment, this condenser enlarger gives consistently sharp prints. As dimensioned here, it accepts any negative up to 2¼" by 2¼". This maximum could be raised to 2¼" by 3¼", however, simply by installing larger condensers and increasing the film-holder apertures.
Computer Built in Camera. This new camera, offered by the Eastman Kodak Company, features a built-in exposure computer on the back. It also has a flash synchronizer and an optical eye-level view-finder. The lens is f/4.5. Shutter speeds range from 1/10 to 1/200 second, plus time and bulb.
Ceramic Made Piezoelectric. A polarization treatment developed by the Sonotone Corporation, Elmsford, N. Y., imparts piezoelectric properties (the ability to convert mechanical pressure into electrical impulses) to titanate, a man-made ceramic.
Bring your radio up to date by giving it eye-sharp tuning plus freedom from blasting. Here’s how for most receivers.
HARSH background noises that come through when a radio dial isn’t properly set won’t spoil your listening if you tune by eye. Sounds may fool the ear, but there’s no deceiving an electron-ray indicator tube. When the eye squints down to its narrowest angle, you know you’re on the beam.
GIVE a loudspeaker enough cord and you can hang it on a nearby limb or simply place it on the ground beside you when you get out of an auto to loll in the shade. For those many times when you are just far enough away from a car for its radio to be of no use, this extension speaker is the perfect answer.
TELEVISION and FM frequencies, with their interference problems from terrain or buildings, are bringing a crop of new antennas. A roof antenna for automobile communication systems, made by L. S. Brach Mfg. Corp., Newark, is shown in Fig. 1.
LOOKING like a single-span truss bridge, this carrier transports heavy farm implements across fields and over highways. Four ratchet spools permit one man to lift a two-ton load into riding position. Chains carrying the load are wound over the spools.
SIMPLE guards to protect flowers and young shrubs may be made from small pieces of lumber and chicken wire. Staple the wire inside the frame and set the legs a few inches in the ground. Paint the frames white.—Bernard Matzen, Napa, Calif.
THIS small garden cultivator was built in about 15 hours, using scrap-iron parts and welded construction. The distance between the wheels may be varied from 12" to 20", enabling me to run it either between rows or to straddle rows. For power, I’ve found a ¾-hp. washing-machine engine satisfactory, though 1¼ hp. might be even better.
THIS wheel-less, 390-lb. dump rake has 28 spring-steel teeth that provide a spread of 10'. The implement, designed for use with light tractors equipped with a hydraulic lift and a three-point hookup, is made by the General Corporation, of Dallas, Tex.
HELD in your hand, a small motor tool is often tough to manage. It takes real practice to make controlled freehand cuts; and the work almost never shows the line-splitting uniformity expected of power tools. The fixture shown on these pages will put an end to that.
THIS roomy linen cabinet has two unusual features: a hand or foot-operated latch and a storage box built on the inside of one of the doors. The storage box is handy for miscellaneous small articles, whether you keep the cabinet in the bathroom or a bedroom, or even the kitchen.
A FUSIBLE sprinkler, with pipes concealed in the ceiling, has been introduced by the Grinnell Company, Inc., of Providence, R. I. The automatic sprinkler was especially designed for rooms where the decorative effect would be spoiled by exposed pipes along the ceiling.
I WANTED tO drill some No. 80 holes but couldn’t find a chuck that would close on such a small drill. Finally I inserted three pieces of wire in a ⅛" collet and put the drill in the center. By tightening the collet, the drill was held true. You can find the diameter of the wire you need by subtracting the drill radius from the collet radius.
SPRING steel from an old phonograph motor or a hacksaw blade makes an ideal landing gear for a gas model plane. I find such a gear absorbs more punishment than the common piano-wire type. Soften the spring by heating, and then shape it. Restore the temper by heating and quenching in oil.
HERE’S a neat way to cut off very small machine screws without damaging the thread or heads. Get a piece of scrap metal the same thickness as the desired screw length. Tap and countersink a hole to suit. Drive the screw in all the way, turn the piece over, and file off the projecting part of the shank.
THESE miniature sailers, modeled after the sand sailers raced on southern beaches, are assembled from the kit shown. The toy, which is made principally of plastic, sports a gaily colored sail, smooth-rolling rubber wheels, and a patented nontipping action.
A COMFORTABLE control handle for control-line models may be made from a discarded saw handle, or from a replacement handle. Cut off the grip as shown in the drawing. Use four eyelets to bush the holes in the grip and prevent the steel line from cutting into the wood.
ORDINARILY, an oxygen atmosphere is necessary to keep a fire going. But like most rules, this has its exceptions. When heated, some substances supply their own oxygen and burn without air. Again, fire is usually thought of as being started by a spark or flame.
You can raise more than enough eggs for a family of four with this hen house that fits in even the smallest of backyards. That is, if the local ordinances in your neighborhood or town permit keeping chickens. Although the house is only 7' long and 16" wide, it accommodates six hens the year round.
WHILE covering pipe with insulation, I ran out of the conventional bands. I made some straps from thin sheet brass which held just as tightly as the conventional type. Cut strips ¾" by 9½". Then slit one end about 1" as shown at the left of the photo.
THIS hitch is useful in carrying heavy objects such as carboys, auto batteries, and other containers that have projecting rims but no handles. If you use a piece of rope such as that shown in the photographs, you’ll have to tie the two ends together to form one of the handles.
GARDEN tools fitted with rubber grips, as shown in the drawing, are easier to use and easier on your hands. Make the grips by cutting the ends from standard bicycle or motorcycle handle-bar grips. Cement them in place.—Don G. Pittwood Moscow, Id.
A SURE-GRIP clip for a flat carpenter’s pencil can be made from a spring-type clothespin. Remove half the clothespin and slip the pencil in its place. To make sure the pencil won’t slip, cut a notch for the wire as shown in the sketch.—Munro Hill, Elbridge, N. Y.
WHEN diluted with its thinner, model-airplane dope can be used as the coloring solution for internally carved plastics. Dope is cheaper and easier to obtain than the usual dyes made for the purpose. The colors “take” readily, are richer and more opaque.
Two bicycle tires that have been badly cut can be combined one inside the other to get nearly the full amount of wear from them. One entire tire is used as a liner for the other, as in the above diagram. Place the casings so the cuts on the inner tire are protected by undamaged sections of the outer tire, while cuts on the inner one are protected by good parts of the outer tire.
LITERALLY, my boat is a headliner. While I’m not an expert sign painter, I came up with a very professional looking job of lettering across my craft’s stern. All you do is watch the large, page-one headlines in your daily paper, and clip out the necessary letters to spell out the name you want.
Good subflooring, surfaced level and with large cracks filled, is required as a backing for a parquetry floor. The hardwood blocks may be ¼" to 1" thick. They may be obtained made up at the mill in assembled squares or in block sets of pieces cut to size and tongue-and-grooved on ends and sides.
You can hide unsightly pipes and wiring with a louver-design, false ceiling that can be installed below fluorescent lights. Consisting of transparent plastic louver sections, channels, and fittings, the sections transmit 71 percent of the light, provide uniform illumination.
WITH a process called Rigidizing thin metal sheeting emerges not only stronger but handsomer. By redistributing the metal in a sheet, the process increases stiffness and at the same time impresses a design. Patented by Rigid-Tex Corp., of Buffalo, N. Y., the process makes steel stiffer by 88 percent, and aluminum, by 108 percent.
THE Cine-Ektar 25-mm. lens opens new possibilities of high speed work to the average 16-mm. amateur movie maker. Opening to f/1.4, the Cine-Ektar is said to offer finer definition and resolution than has yet been possible at such a wide opening.
JOT down a note on this desk pad—and it’s permanently filed. The knob at the side of the case turns a roller, which feeds paper over the pad and up and around a plate that fits into the writing bed. To get a clean writing surface, the plate is flipped over.
Did you ever want to float down the river like Huck Finn on his raft? Well, now you can do it and take all the comforts of home in this DoALL Houseboat Cruiser. And when you want to go upstream, the vessel’s two 165-hp. Diesel engines can take you 1,000 miles, at 8½ miles an hour, without refueling.
WHEN you want to inflate this new beach mattress, you just screw the tubelike carrying case to the inflation valve on the air mattress—and pump. As shown in the photo, the tube has a built-in pump, and a few strokes fill the mattress with air.
GREGG shorthand students can make an accurate check of word outlines by holding a corrective slide, shown in the photo, over their notes. Printed in opaque red ink, the outlines on the Lumarith plastic slide offer a sharp contrast for comparing characters.
THESE portable, battery-operated flood-lamps light up automatically in an emergency. Plugged into any standard outlet, they switch themselves on when regular power fails, and off again when it is resumed. Available in 15and 25-pound sizes, the units have a voltmeter for checking battery strength, and an indicator bulb that burns when the lamps are on.
EYESTRAIN is eliminated when workers in poorly lighted areas use this tally board with lamp attached. Its lighting assembly has a three-volt bulb and three standard flashlight cells, assuring long battery life. Designed for heavy duty, the entire unit weighs only 24 ounces.
FEWER sheets of carbon paper are wasted by a typist if she uses a new, moisture-resistant type of tissue that will not curl. This is accomplished by applying a coating of Vinylite plastic to the back of each sheet. In addition, the new carbon paper is said to be less likely to tear in handling.
Wet Clothes Are Quickly Dried on Frame Over Radiator
New Trick for Tool Grinder
Plug Locks In Outlet
EggS are not always what jan. 1922 they seem. An inspection of the shell gives no idea of the condition of the yolk. Here is an egg tester that will reveal the hidden inner truth. Make a cardboard funnel with the small end just large enough to take the bulb end of an electric flashlight.
I HAVE just come from enjoying an experience permitted to few laymen. I have looked through the eyepiece of the largest and newest telescope in the world, perched atop Southern California’s Mount Palomar. I got a big kick out of it. And I think you would have, too.