THE Lilienthal Affair underlines the low place of science in the government structure. And it raises the question whether science, which has become politics, should not have political representation “on the Cabinet level.” Might not a Cabinet which includes Secretaries of Agriculture and Commerce, pull up a chair for a Secretary of Science?
The jaws of a 7,000-ton Carnegie-Illinois forging press are squeezing this huge steel ingot into a pole piece of an 1,100-ton magnet for the second largest cyclotron in the U. S. Designed to produce particles of more than 200,000,000 electron volts, the atom smasher is being built at the University of Rochester as part of the Navy’s radiation research program.
Automobiles still kill tens of thousands; they’ll go on doing it until you and the rest of the buying public are ivilling to pay the price of safety.
What Price Visibility?
The Canvas-topped Killer
Safety Aids Galore
Faults by Inheritance
Advancing the Driver
Supports May Move
Problems of Impact
Safely Isn’t Gratis
YOU have left the outskirts of town and are rolling on the highway, the speedometer comfortably short of 50. Your car is fresh-tuned for spring; tires are newish, brakes sharp; there is not a squeak or rattle to spoil the purr of the engine. Suddenly, a car comes toward you.
INCLUDED in the new Naval Ordnance Laboratory being built at White Oak, Md., are three German supersonic wind tunnels that have been transplanted from Kochel, Bavaria. The supersonic German “factory” is described as far ahead of any other apparatus in the world for simulating speeds beyond that of sound.
THE Northrop YB-49, newest bat-wing bomber for the AAF, is a jet-propelled version of the 172-foot B-35 Flying Wing. A model, above, shows how the eight GE jet engines, delivering a total static thrust of 32,000 pounds, are arranged in two clusters of four each.
ALREADY overworked electrons have taken on still another job. The Cathotrol, a new compass, uses the magnetic deflection of an electron beam to tell direction. Developed by the Minneapolis-Honeywell Regulator Co. for aircraft and ship navigation, it is essentially a flashlight-size cathoderay tube (at left, below) suspended face down from a universal joint.
ANTU must be used wisely to destroy whole colony at once.
Baltimore Rats Slaughtered
Careful Planning Essential
Rats Often Unseen Guests
Straight or Mixed
Combined Attack Most Successful
Block Holes on Third Day
GEORGE H. WALTZ
SCIENCE is working from A to Z in its war against disease-carrying pests. A few years ago DDT made its debut as a sure-fire pest weapon for home use. Now a new one—ANTU—has been added to the alphabetical arsenal. ANTU is to rats what DDT is to insects— a powerful, quick-acting, one-shot poison that is easy to use.
Attack, picket, transport, cargo, aircraft carrier and guided missile ships will supersede all-purpose, fleet-type subs.
Reconnaissance & Picket Type
ON April 11 the United States Navy celebrates Submarine Day, in honor of all American submariners and especially the 55,000 who helped win World War II. Even while the nation pays tribute to the undersea fighters’ past exploits, however, Navy strategists are studying plans for their future —in a submarine fleet comprising at least six different types of ships that can carry out all the missions of Atom Age warfare while escaping most of its perils.
A railtraveling bulldozer (above) is used in a unique method of track-grading devised by Hamer Brothers, Inc., of Detroit. Riding atop earth-piled flatcars, the bulldozer dumps the dirt along the tracks. Steel runways permit the tractor to move between the flatcars.
It took a tugboat, a barge, and three flatcars to haul this giant 165-ton oil-refining tower from New Jersey to a refinery in Sugar Creek, Mo. The 2,025-mile trip, made largely on water, took 32 days—good time for this traveler.
The “two-engine” Navy patrol bomber above— the new Martin XP4M-1—really has four power plants to zoom her upward. Allison jets, providing 4,000 pounds of thrust apiece. are mounted (inset) directly behind each regular 3,000-hp. Pratt & Whitney engine. The plane cruises at 200 m.p.h., can do better than 350 m.p.h., and has a range of more than 3,000 miles.
This single panel has everything for air traffic control; if need be, one man can run it alone. Flight plans, flight conditions, instrumentand contact-flight records are all ready in the center of the AAF Control Tower Console, shown undergoing extensive tests at Langley Field, in Virginia.
A pilot sees at a glance how much gas is going where with the fuel control panel used on Boeing Stratocruisers. Bottom dials show supply in each tank, lines mark fuel pipes, knobs control and indicate flow direction.
Since Naval fliers always face the danger of a crash landing at sea, they are now being trained beforehand, in the safety of a swimming pool, to escape from their sinking plane. Picture at left shows a simulated cockpit, with pilot and gunner, about to hit the skids. At right the “Dilbert Dunker” crashes into the water. The men must now get out of their safety harness and free their emergency equipment—all in a few seconds while the cockpit is still in motion.
WITH perilously little gas left in its tanks, an Army Air Forces P-82 twin Mustang swooped down on New York’s LaGuardia Field on Feb. 28 to complete the longest nonstop flight ever made by a fighter plane. It had flown all the way from Honolulu—5,051 miles—in 14 hours and 33 minutes, averaging nearly 350 m.p.h.
A new “nuclear induction” machine may soon provide a faster, more practical method of chemical analysis. The substance to be analyzed is placed in a magnetic field, and the outer of two surrounding coils (inset) is charged with a high-frequency current.
To snatch valuable scientific and operating data from speeding rockets before they are dashed to destruction, General Electric has developed a telemetering unit that weighs only 15 pounds and transmits 28 items of information every 1/35 second.
Today's research teams speed creation of new products.
How Research Teamwork Works
SCIENTISTS play on teams these days. The corny tintype of the long-haired fellow who locks himself into his bleak garret laboratory and emerges with a long beard and a great discovery is as remote from present-day research as the alchemist.
The correcting lens, at right, undergoing inspection after polishing, removes aberrations after a mirror has enlarged a television image to five times the prewar size. The American Optical Co. makes both mirrors and lenses.
Ford engineers see a new plant in three dimensions long before the ground is broken. They put their model makers to work and view the plant scaled ¾ inch to the foot. Below, a worker is placed near a “giant” press.
There’ s not only room but a place to put your feet up in the Great Northern’s new day coaches. A rack drops down from the back of the seat ahead. The seats also swivel around to face the windows or the car’s rear. The new coaches are used on the streamliner Empire Builder.
To provide printed communications for aircraft in flight, Bell Telephone technicians developed the teletype printer at left. The printer itself weighs less than 24 pounds, and a complete airborne installation adds only about 35 pounds to a plane’s load.
YOUR new house may be built in a cradle and rocked into place. That’s the latest method of mass-producing concrete houses, developed by Charles Tyroler, New York engineer, to help solve the housing shortage. For an ordinary concrete house, complicated forms must be built or fitted together at the site, or expensive machinery is needed to transport precast walls and lift them into place.
ON THE 1,000-square-mile desert range of the Naval Ordnance Test Station at Inyokern, Calif., rockets are undergoing exhaustive—and spectacular—tests designed to improve their hitting power and destructive force. From the rockets’ fiery performance before high-speed cameras and other precision instruments, Navy scientists learn not only how to make existing types more powerful, but how to design new ones and how to devise new ways of using them.
15 seconds after photo is snapped it's on the screen.
FIFTEEN seconds after the camera above snaps your picture you’re looking at yourself on the screen, larger than life. The involved processes of development and projection have been carried out automatically in the time it took you to hang up your hat and coat.
This compact organ can produce all the sounds of one with 1,333 pipes—without having any at all. The secret is in electronics: Vacuum-tube oscillators do the work of the usual pipes. Called the Connsonata, the new organ is made by C. G. Conn, Ltd., of Elkhart, Ind.
After 130 years, the old-fashioned metronome at left has a rival—the Metronoma. Clockwork and pendulum are replaced by a thyratron, or "heartbeat” tube, which produces an electrical impulse anywhere from 40 to 208 times a minute.
IF YOU take a sheet of clear plastic, buff the edges to a glasslike finish, and direct light into one edge, the sheet will conduct it much as a pipe carries water. No light will be visible on either face of. the sheet, provided the source is shielded and the surfaces are unmarked.
Everybody has his own pet idea of some gadget he would like to see in general use. What is YOURS? Popular Science Monthly will pay five dollars for every such suggestion that its editors decide to publish. Nose Warmer. It would be a lot more comfortable if earmuff makers added a puff for the nose, thinks Ann Lindhardt, of San Juan Pueblo, New Mexico.
This selfpropelled McCormick-Deering harvesterthresher can be operated by one man when it is equipped with a grain tank or by two men when equipped, as shown, for bagging the grain. It is driven by a six-cylinder engine and has four speeds forward.
A narrow tractor and offset disk harrow are combined for cultivating between the rows of orchards or vineyards. Plowing and harrowing are done in a single operation, and the two rows of disks leave a smooth surface.
THRILLING speed and safety are combined in the tri-maran, modernized adaptation of primitive outrigger sailing craft of the South Seas. Designed by Victor Tchetchet, New York artist, the aquatic novelty rides on three floats, instead of the two of a conventional catamaran.
For loading and Unloading grain or other granular materials, Milton O. Glessner has invented a combination blower and swivel-connected tube that can be mounted on a truck. The apparatus is connected to the truck’s power take-off through a shaft and universal joints.
NOTHING spills dollars out of a movie producer's budget bag quicker than delays on the set after his cameramen have begun shooting the actual picture. So now, borrowing a practice increasingly favored by progressive industrialists, producer Cecil B. DeMille first builds his studio sets to scale in miniature so he can plot definite scenes, action and camera angles long before the cast and the technical staff for a picture go on the pay roll.
HOWARD E. CHESEBRO’S job is a workshopper’s dream: He makes exact scale models of everything from airports to appliance stores—and is paid for his fun. For Chesebro is General Electric’s official modelmaker—and GE engineers have found that it saves time and money to have him turn their blueprints into three dimensions before building the real thing.
TAKING the XB-42 Mixmaster as a partial pattern, Douglas Aircraft has produced an all-metal, five-passenger, propeller-in-the-tail airplane for executive use or for charter-operated service. The Cloudster, as it is cailed, has two 250-hp. Continental engines housed inside the fuselage, and either or both can be used at will without departing from the centerline-thrust principle.
RIDING to work on subway or bus some morning you’re going to get the surprise of your life. You’ll look up from your newspaper at an advertising card across the aisle. The familiar red-bandanna’d mammy—but her arms and the platter of goldenbrown hotcakes she is holding will stick right out at you, so lifelike you’ll be sure you can reach out and help yourself.
This small two-cycle gasoline engine works like a man elbowing through a crowd: Its three cylinders are double-ended; each explosion drives two pistons at once. Intended for boats or planes, the 120-hp. motor weighs only 150 lb.—100 lb. less than any comparable aircraft engine, says McCulloch Motors, of Los Angeles. Fuel economy equals the best four-cycle engine’s.
RADIO broadcasters now get their own “weather reports” predicting clear or cloudy conditions—but they don’t tell engineers when to wear their rubbers. The forecasts, prepared from nation-wide observations by the National Bureau of Standards, warn when and where to expect short-wave broadcasting troubles.
Magnetic Strip on Film Promises Low-Cost Sound Movies
OF ALL the devices that talked themselves into the history books during the recent war, none talked longer, louder, or clearer than the continuous-strip recorders. They put the voice of battle onto thousands of miles of wire, film, and metalized tape.
THE ancient warning to people living in glass houses assumes literal significance at the University of Colorado, where glass roofs are being used to catch energy from the sun. One small house, its roof covered with beds of glass panes arranged shingle-fashion, is completely heated by this system so long as the sun shines.
THAT old farmer who refused to replace his horses with a tractor because it wouldn’t give fertilizer may be converted to the machine age yet. A new small distilling unit that processes farm crops into alcohol for tractor fuel also makes fertilizer or feed as a by-product.
You can see how the spiral bevel gear, right, works without taking it apart. It is enclosed in a boxlike case, bolted together of thick, machined pieces of Plexiglas. Turning an exterior rod operates the gear. The demonstration model was made by M. L. Bayard & Co., Inc., of Philadelphia.
To test new gas-turbine and jet engines, the Navy needs an accurate temperature measure. Ordinary pyrometers have shields—to protect the thermocouples from radiant heat —that are too bulky, slow response to heat changes, and block gas flow.
The new Stewart-Warner South Wind, based on the principle of an airplane heater, is now becoming available for home use. A sealed-flame system, forceddraft blower, and vents to the outside, combined with small size, make installation possible between wall studs or in floors or ceilings.
Known as the Has-o-Rak, this space saver serves as a low seat beside the phonograph and also as a storage case for 50 records. A dropfront door provides easy access to the disks. The finish is simulated leather. Peerless Album Co., Inc., of New York, offers it for under $25.
Clamped on a rung ladder, this device provides a firm, steplike footing. The clamps are affixed to the rung from which work is to be done and to the one below, and then tightened with wing nuts. Made by the Tara Manufacturing Co., of Chicago, the ladder step is listed to sell at retail for about $3.
Here’s a complete set of six clubs made up of only two heads and a single, adjustable-length shaft. The set is made by Jakosky Co., of Los Angeles, to retail for about $25. A second model that folds down to traveling-bag size is priced at under $40.
Seeds are removed from olives, too, by this kitchen gadget. The fruit rests on a cushioned holder that protects it from bruises. Pits drop into the jar on which the plunger is mounted. R. Krasberg & Sons Mfg. Co., of Chicago, price it at $1.
Designed for cleaning conditioned and warm air, Westinghouse’s Precipitron works on the principle of ionization. Air enters through a duct and passes through a screen of airturning vanes to an electrostatic field where the dust particles receive a positive electric charge.
The Silver Creek electric power unit attaches to standard hand-pushed lawn mowers. It is adjustable to fit various widths, power is controlled by a switch at the handle, and a lever raises the unit off the wheels to permit easy backing. Current from any 115-volt outlet recharges the battery on which the motor in the device operates.
WHAT the future holds for this six-cylinder horizontally opposed engine is not yet clear, but there’s a chance you may find it in some of the really new postwar cars still to come out of Detroit. Air-cooled, light, and efficient, it is said to be suitable for either front or rear drive.
Supermodern models designed by two long-established auto manufacturers in Europe have removable rear engines.
R. P. STEVENSON
IMAGINATIVE artists for years have been sketching cars of the future as sleek vehicles with superstreamlining. Now in production in Czechoslovakia is a car that approaches these dream cars in appearance about as closely as anything yet produced on either side of the Atlantic.
Using a suspension point that is substantially higher than the point of contact with the car, a bumper jack produced by the Johns Manufacturing Corp., of Dunellen, N. J., consists of a steel A-frame on which rests a free-swinging jack bar with a friction lifting unit.
The advantages of a mop and a hose are combined in a new device, the “Jack Robinson” continuous-flow car cleaner, now being marketed by Corbett Patents, of Altrincham, England. Water from a tap flows through 20' of hose, a metal pipe that serves as a handle, and sprays from the detachable mop.
Intended for use by disabled trucks, this new device employs four red plastic reflecting lenses mounted on a set of swivel-type metal legs. When the unit is set up on a highway, approaching automobile headlights are said to reflect a warning signal visible from half a mile away.
Attached to the car visor with a strong elastic cord, the holder shown above makes it possible to keep road maps, guide books, and other reference material within easy reach and sight while driving. Produced by Visor-Ads, of West Hartford, Conn., the device is made with a clear plastic front, reinforced with steel wire to increase its durability.
STAN HICKS was on the phone a long time. From where Gus Wilson was working he could see an earnest expression on his young helper’s face. “Probably making a date,” Gus grumbled, “but he’s sure taking his time about it.” With some annoyance he began scraping the carbon from a cylinder head.
CRAFTSMEN who like working in aluminum will find tubing 1" and 2" in diameter an extremely satisfactory medium. Such projects as the vase with an ornamental stand shown above, the wall vase at left, and the pair of matching vases and dinner bell illustrated on page 166 can be made with it.
Chucked into a ¼ electric or pneumatic drill, the Royal Clipper Metal Cutter produced by the C-B Tool Company, of Lancaster, Pa., leaves a smooth edge that requires no grinding or filing. The regular model cuts light metals up to .040" while the heavier-duty model will handle average sheet metal as heavy as .055". The tool also can be used to cut plywood, plastics, cardboard, and linoleum.
Cast of aluminum alloy and equipped with a cadmium-plated steel fence, this auxiliary 13" by 18" drillpress table offers an enlarged and true working surface for many drill-press operations. Manufactured by the Barron Tool Company, of Detroit, it comes supplied with an irregular shaping pin, anchor bolts, fence, and fence-clamp assembly.
Thinner and less bulky in use than ordinary tape, plastic electrician’s tape made by the Minnesota Mining and Manufacturing Co., of Saint Paul, Minn., has an elastic, rubberlike vinyl backing, coated on one side with adhesive. The backing has high dielectric strength.
Compact and sturdy, the British-produced hand drill below has ribs on the inside of the handle to prevent the hand from slipping while the tool is in use. First shown in London at a display of new British products, the drill is manufactured by the Leytonston Jig & Tool Co.
Although designed for flattening, smoothing, and dent-removing operations in automotive shops, a finishing hammer produced by M. F. Robertson Sons Co., Darby, Pa., also has a practical value for home tool chests. Each hammer is supplied with a felt-lined metal cover to protect the face when not in use.
HERE is something different in knickknack shelves. This self-illuminated corner cabinet not only lights up the objects on its shelves but provides also a mild indirect room light—enough to give a soft glow in a small hall or to brighten the corner of a large room.
SEAGOING accessories are always popular in a den or game room for their note of outdoors and adventure. This wall lamp is built to represent a ship’s cargo boom, with the mast against the wall and the lamp and shade suspended from the boom. If the room is large, a pair or more may be wanted.
Using surplus airplane parts, Wat Slee, of Seattle, built a two-way hydraulic press for inserting and removing bearings, bushings, and the like and for straightening and bending jobs in his home workship. With 4 sq. in. of piston surface in his cylinder, he has a 4ton press using 2,000 lb. of oil pressure from a 1" bore hand pump.
Like the postman who hiked in his spare time, Engineer Jack M. Fesco, of the Southern Pacific, worked on his model caboose. Made on a scale of ¾" to 1', it is complete in every detail including inside fittings. Parts were put together with 3,000 rivets and 1,000 screws.
This model of the old Hartford was made by Paul Chamberlin, of Alhambra, Calif., from PSM plans. Work was almost entirely by hand, the only fittings purchased being the deadeyes, blocks, anchors, and belaying pins. The guns were turned from brass and electroplated black for a realistic appearance.
Hydraulic linkage between the ⅝-hp. engine and the drive wheel makes gears unnecessary on this scooter built by Cpl. E. C. Cole, of Lost Hills, Calif. The scooter has two speeds, gets 70 miles out of a gallon of gas, and will carry three men, with sidecar, at 35 m.p.h. It will speed up to 45 m.p.h. when not taking the two passengers.
FOR a home with early American furnishings and old-time knickknacks to display, this simple shelf will add an authentic note. Centered over a low bookcase or other furniture, it takes the place of a picture. Choose good wood, such as nicely grained pine.
HEATED in the kitchen oven, a ⅛" by 1¼" by 10" length of clear plastic can be bent to shape for a modern hat and coat rack that can be attached to the inside of a closet door. First, using a coping saw, taper one end of the coat hook, and smooth all edges with fine sandpaper.
Not simple to make, but still basic to many a project, boxes call for woodworking skill.
JOHN P. ARNOLD
BOXMAKING on a production scale is a highly specialized branch of woodworking, and yet boxes are a basic form of so many projects that the home craftsman is often called upon to make them. Applications of the box structure range from hope chests to jewelry cases, and to such divergent things as newel posts, plywood suitcases, bookcases, cabinets, and other furniture.
IF YOUR outdoor stove is put under a roof along with an airy playroom, neither hot sun nor rain can spoil your back-yard or lawn parties. Lattice provides a cool, open finish, strengthens the structure, and serves also as a trellis for growing vines.
ON HOW doors are hung depends the service they will give—whether they will bind at the edges, have draft-inducing gaps, or fit snugly and open and close easily. The same is true of window sash. Select the best doors for the best rooms, carry them to their locations, and stand them on blocks.
IT'S AN ART to quiet a bawling baby. When the kid I was watching yowled, I soothed him by taping cutouts to a phonograph and projecting moving pictures onto the opposite wall with the beam of a flashlight.— THE NOSE KNOWS when the water pan of a hot-air furnace runs dry.
Homemade Brake Makes Accurate Bends for Metalwork Projects
CRAFTSMEN who work with sheet metal know how stubbornly it can refuse to take a clean, sharp bend where the layout line demands it. A bending brake is the answer, of course, but they’re usually thought to be difficult to make or expensive to buy.
WHEN a screw must be threaded into a tapped hole that can’t be reached by hand, time will be saved if it is fastened to the screwdriver. This can be done by grinding down the blade of a long-handled screwdriver until it is about .005" thicker than the width of the screw slot, and then grinding a slight taper to form a wedge.
WORN brushes can be reshaped or special ones made to suit the job. Soak the bristles in water-soluble glue, shape to a compact mass, and let dry. Then rub on coarse abrasive paper to the form desired. Remove the glue in hot water.
Want to put that brook to work? Here's the first of a series on how and where to engineer your own back-yard Boulder Dams
C. D. BASSETT
MANY farms, ranches, and other fairsized tracts of land embrace at least one brook within their limits. In most cases, the idea that a small stream can provide a useful source of power has never occurred to the property owner or, if it did, has been rejected as silly.
AMATEUR machinists who run the models they build will get double pleasure from this miniature vertical steam engine. Although it is not a scale reproduction of any particular engine, it has the same general appearance and eye-taking appeal of the picturesque old-timers so hard at work about the turn of the century.
SPECIAL DRILL HOLDERS. Here are two easily made devices to help keep your drills in order. The circular container below serves both as a storage place and as a selector for drills between Nos. 61 and 80. At the right, a gauge is used as a stand for that extra set of high-speed precision drills which you want to give special care.
MODELMAKERS who need small socket wrenches for assembling their projects might try using standard hollow-head screws. These screws are usually of good steel and fairly hard, but not so hard that they can’t be turned in the lathe without annealing.
Self-Heating Solder Does Job Without Use of Iron or Torch
MANY soldering jobs can be simplified by the use of a new soldering tape that carries its own heat and is ignited with a match or cigarette lighter. The tape is made up of solder on one side and plastic containing a chemical fuel on the other. Twisted solderside down on spliced wires, or laid over a hole to be plugged or between two metal surfaces to be joined, the solder can be flowed onto the work in less time than it takes to heat a torch or soldering iron.
AN ARC-WELDING starter that eliminates contact between the electrode and the work and prevents blown fuses caused by the electrode freezing to the work is offered by the Electrical Engineering Company, of Indianapolis, for both A.C. and D.C. welding.
METAL cut from a large tin can will provide the material for the body of this convenient slide viewer. The only soldering required is where the edges are fitted together into a seam at one corner. Before cutting the metal, determine the working distance of the lens by experiment, for this will determine the length of the viewer. The model shown is 3½" long and 1 13/16" square. At one end, tabs on three edges are bent into a U-shape to receive the slides, and at the other tabs on all four edges are formed into clips to hold the lens.
Two 18-mm. lenses, each having a focal length of 50 mm., can be mounted in a standard electrical conduit connector to make a convenient hand magnifier. The conduit connector comes apart in three pieces. In each end piece, sandwich a lens between two fiber washers, ¾" in diameter with a ⅜ hole. Then screw the parts of the connector back together.
MOUNTED in this plastic holder, a magnifying lens is less likely to be damaged when you put it down. Cut a groove 1/16" deep equal in length to the circumference of the lens, using a V-shaped chisel or a routing tool. Smooth and round off the edges with sandpaper, heat the plastic in an oven until soft, remove with gloved hands, and bend around a suitable form.
THERE is a Latin proverb, “De gustibus non est disputandum,” that means, “You can’t argue about taste”—but the Romans didn’t know anything about cameras. We photographers can’t help arguing about taste, and we even get something out of it.
PROCESSING MOVIE FILM. Amateurs who shoot their own movie titles on positive stock can develop lengths up to 36" on cut-film hangers. Tape one end of the film to the upper corner of the hanger, wind the film around the frame as shown, and tape the other end also.
THREE-TUBE CIRCUIT PERMITS COMMUNICATIONS RECEIVER TO OPERATE UP TO 1,000 HOURS ON BATTERY PACK
LIST OF PARTS
THREE tubes for a two-band superhet doesn’t suggest much power, but there’s plenty of pickup and drive in this circuit to pull in the 20 and 40-meter ham-band transmitters as well as short-wave broadcasts from Europe and Australia. Reception on the broadcast band is clear and loud; a 10-foot hank of antenna wire strung out along the floor will usually be sufficient to get local stations at full loudspeaker volume, and an external ground can be omitted altogether.
PRACTICALLY all commonly used rectifier tubes are now replaceable by drydisk selenium rectifiers. They not only take the place of hard-to-get tubes, but are also smaller, cooler and quicker in operation (because they have no filaments to warm up), and they won’t burn out or break under conditions that generally damage tubes.
DX BOOSTER. For hams who have trouble picking weak signals out of the crowded, noisy airways, General Electric has designed the broad-band preamplifier and impedance-matching unit shown above. The combination of matching antenna to receiver and adding an extra RF stage is said to increase gain up to 60 db.
1. Never run the cutter twice over the same line. This dulls and eventually ruins the wheel. A single pass with firm, even pressure is required. 2. The pane should be a close fit, but not so close it has to be forced into the rabbet. Cut the glass ⅛" short each way, allowing a clearance of 1/16" all around.
WHEN a jointer or small shaper is available, an auxiliary fence with four stops spaced to limit cutting simplifies quantity production of identical hinge-knuckle gains. The stops are so placed that the cuts will be at equal distances from both ends.
Fully Adjustable Bench Light Will Cover Wide Range
As MY workbench is a long one, I needed a good light that would really get around. This one does. The wall mounting is a ¾" floor flange with a 7" length of ¾ pipe slotted to fit a ½" nipple snugly. Lengths of ½" o.d. aluminum tubing, 30" long for the rear, 21" long for the front, form the arms.
WHEN extra sheets have to be added to a stamp album, they are usually in blank form except for border lines. A template cut from stiff cardboard or thin plastic will help get even spacing. The sheet should be the same size as the album page. Rule and cut with a sharp knife along a straightedge two or three rows of rectangles for average-size stamps and a row or two additional for over-size ones.
IMAGES IN THIN AIR. An inverted image of an object in strong light can be made to appear at the center of curvature oí a magnifying shaving mirror. This is an interesting experiment to perform with an empty vase set on a blackened stand under which a small bunch of flowers has been tied upside down.
How to mount the big one that didn't get away. A taxidermist describes a quick home method.
WOULD you like to save that prize catch as proof of your favorite fish story? You can easily mount it on a plaque to confound all doubters. By a new method using a plaster of Paris core, the old tedious carving of a balsa-wood form for the skin is dispensed with entirely, and actual worktime on the job is cut from seven hours to 30 minutes.
EXPERIMENTS conducted at Michigan State College hold a promise that fruit growers and truck farmers eventually may be able to use radiant heat to prevent frost damage. In the tests, a huge oil burner and an electrical unit both were successfully employed to direct radiant heat on the vegetation and keep it above the frost point without using the air itself as the medium of heat transfer.
Motorized Drum Gluing Machine Coats Work Swiftly and Evenly
WHEN Russell Jackson, of Angola, Inch, expanded his home workshop for the production of instrument cases, he built this drum gluing machine to speed the job. A 5-qt. stainless-steel glue tank is flanged so it can be set into a 6" by 8" by 17" sheet-brass casing with 1¼" clearance all around.
Permanent Concrete Support Takes Sag Out of Old Garage Wall
SAG in a garage wall traced to a rotten mudsill can be permanently repaired by replacing the old sill with a concrete foundation. At several points along the wall, jack the sinking studs with a hydraulic or heavy screw jack. Wedge twoby-fours under the plate at each of the jacked-up points until the wall is level.
WHEN an informal garden or a lawn requires terracing, concrete stairs connecting the various levels are frequently too formal to carry out the landscaping scheme. The set of stairs shown here has a charm of unconventionality that is impossible to attain with cement or bricks.
Simple tests in your own kitchen or home lab give you the low-down on what's in the common articles you use every day.
KENNETH M. SWEZEY
HAVE you ever wondered if you were getting the ingredients you paid for in your packaged foods, cosmetics, and medicines? The chances are that most of them, at least, contain just what is claimed, for the Food and Drug Administration of the Federal Government keeps a close check and, besides, no reputable manufacturer would care to risk loss of good will for the sake of unfair profit.
PREFAB FARM BUILDINGS. To reduce the cost, several firms now are producing various farm buildings and structures in prefabricated form. Many already are in use in the West. Here, workmen are seen piecing together a large prefabricated corn crib on an Illinois farm.