Spring-Driven Boat Model
RIVER boats, with the paddle wheel at the stern, are well known in many localities. A simple little model, which will run fast, can be made as shown, from a board.
A, 18″ by 6″ by 1/2″ thick (although any size may be used) with a 3″ by 4″ notch cut in one end for the paddle wheel, and the other end tapered as shown.
The paddle wheel’, B, consists of two bent L shaped pieces of tin soldered to a 1/8″ metal shaft. The shaft is placed in screw eye bearings. To hold the front of the boat down the lead weight D, may be used.
Two stiff steel springs, C, with strings, E, attached to the free ends, are mounted on the board. The other ends of the strings are securely attached to the shaft. Wind up the wheel and the boat is ready to go.
Water Succeeds Gasoline As New Invention Is Perfected
WATER powered automobiles are predicted for the not too distant future as the result of an invention of G. H. Garrett of Dallas, Texas, which substitutes water for gasoline.
Garrett uses an electrolytic carburetor which breaks up water by electrolysis into its component gases, hydrogen and oxygen, and then forces the explosive hydrogen into the combustion chambers for fuel.
For operating the automobile motor on which the tests have been conducted, Garrett has added an over-size generator to supply the extra electricity needed by the carburetor. Beyond that, the motor has needed no changes, though it has been in operation continuously for several days.
Garrett has protected his device with patents.
CREATING LIFE LIKE Figures For WAX MUSEUMS
by HAROLD L. ZIMMER
Washington, Roosevelt, Billy the Kid, Jesse James! All the world’s most colorful figures stand out with startling reality in a wax museum. This article tells -how workers transfer a simple photograph into amazingly life like figures sculptured in tinted wax.
WHERE do the horrors in the wax museums come from? This question may have troubled you as you paused in a side show for a few pleasant shudders. So realistically are they made, so gruesomely exact in every tiny detail, that it would seem the artist must have had the original models pose especially for him.
New Projector Throws Illustrations Behind Speaker’s Back
FACING the audience as he talks, a speaker may now illustrate his lectures on a screen behind him without turning around with the aid of a novel optical projector recently perfected by a well known German firm.
The speaker, directly facing his audience, illustrates his talk by writing or drawing horizontally on a sheet of cellophane lying on a glass table before him, and the script is projected, ten to fourteen times enlarged, on the wall screen behind him.
Underneath the glass table, the light of a 500-watt bulb is condensed and reflected through the transparent cellophane. The lines then pass through a lens to the mirror and -are projected onto the screen.
Giant Radio Has 37 Tubes
EQUIPPED with 37 tubes and six speakers, the largest of which is 18 inches in diameter, one of the largest radio sets in the world has been produced by a Cincinnati, Ohio, radio manufacturer. The set is nearly five feet high and weighs 475 pounds.
The huge radio has a tremendous volume range with a maximum output of 75 watts, yet it can be tuned down to normal living room volume without distortion of tone quality. Four chassis are required to mount the working elements.
The set is capable of reproducing from 20 to 20,000 cycles of audio frequency, although the normal human ear is incapable of hearing above 16,000. The dial of the receiver is 12 inches in diameter.
Precious Radium is Medicine’s Treacherous Helper
Rare metal is teamed with common lead to become an ally of science.
Weird masks impregnated with lead shield this doctor from the withering rays of radium held in the tiny vial. These same rays become healing agents when they are properly directed.
Leftâ€”-This solid lead container protects hospital attendants who transport radium. Aboveâ€”â€”Guarded by a lead shield containing thick lead glass, a nurse restores a vial of radium to its holder. Rightâ€”Lead vaults for radium. Box marked 100 contains one-tenth of a grain of radium. It is worth $7,500.
Lead is the only thing radium rays will not penetrate and without a lead shield, this interne must work at a distance. Right-â€”Radium is now valued at $1,000,000 an ounce. It looks like a white salt, and each grain must be well guarded.
Fishermen Match Technique With Golfers in “Golf Casting”
GOLF casting” a game originating on the Pacific coast, has developed a keen spirit of competition among fishermen who pride themselves on the accuracy of their bait casting. The game, played on a regulation golf course, consists of casting a tournament plug down the fairway and into the cup, the number of casts required being scored as in golf. Casting “drives” of 300 feet or more are not unusual when tournament rod and reel are used. So successful are the fishermen at placing their plugs that in many instances a 100-foot cast has landed the plug within a foot of the cup. Scores compare favorably with those made in golf in spite of the greater distance the golfer can drive his ball. Accuracy is the scoring factor for the plug caster.
ALL ABOARD FOR OUTER SPACE!
Is this the ship that will take us to earth’s first manned satellite?
By G. Harry Stine, Viking-Aerobee Operations Engineer, White Sands Proving Grounds
ON May 24, 1954, a Navy Viking rocket thundered 158 miles into space.
As recently as February 1949, a V-2/ WAC-Corporal “Bumper” rocket soared 250 miles into the sky over New Mexico’s White Sands Proving Grounds.
Just last year, an Air Force pilot flew the Bell X-1A rocket plane “above 80,000 feet” and at more than twice the speed of sound.
We have built rockets which have gone beyond the earth’s atmosphere and returned; they have reached altitudes where the remnants of the atmosphere around them were a better vacuum than that in a radio tube. We have sent men to altitudes where their blood would boil if they were not protected by a pressure suit and a pressurized cabin.
Eyeglasses for Dogs
BY MENTIONING that her dog seemed nearsighted, a girl customer started an optician of Geneva, Switzerland, on his way to becoming a specialist in fitting canines with glasses. Not only did he succeed in curing her pet, but now he has found a novel and profitable career in applying his newly discovered methods to other four-footed subjects.
Home Unit Extracts Vegetable Juices
A NEW electric juice extractor makes it easy to prepare fresh-vegetable juices of every description at home. When carrots, beets, celery, spinach, fruits, and berries are fed into its motor-powered shredder, they are instantly reduced to pulp. Collected in cloth bags, the product is said to yield all its vitamins, minerals, and other valuable nutritive elements in a powerful hand press, where tons of pressure exerted by means of a convenient lever squeeze out every drop of juice and leave only a bone-dry residue behind in the bag.