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SEEING SOUND With A Home-Made Oscillograph

by MAXWELL R. GRANT

Hooked up to the loudspeaker terminals of a radio this device converts music into rhythmic light rays.

FASCINATING mysteries of sound can be explored with a simple oscillograph made from junk-box parts. Plugged into your radio set, it will convert programs into wiggling lines of light, moving across a screen. Read the rest of this entry »

TIN CAN JEWELS
AUTHENTIC copies of European crown jewels, in tin and glass, are the hobby of Dick Stier of Bloomfield, N. J. Stier, himself of noble German descent, got on the kick watching the coronation of Elizabeth II, now has crown jewels of the czars, the Pope, German royalty—all meticulously copied in fruit can metal and junk gems.

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Winners in NEW USE for Old Fords Contest

MODERN MECHANICS pays $10 for every acceptable photo and description of the odd uses to which old Tin Lizzies have been put. The machines shown below are all made from old Model T Fords.

DOWN at Iowa Park, Texas, is an old flivver motor which is enjoying a ripe old age puffing and grunting on half her lungs while the other half supply fresh ozone for tires which have lost the courage of their convictions.
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BARREL STAVE SKIS

IF ONE of your bunch can scare up a barrel, that barrel will furnish staves for a dozen skis. You will see by the diagram that a piece of board is fastened several inches forward of the center of the stave, and that a house slipper is nailed to this board. If you lack a slipper, cut down an old shoe or overshoe. For a more efficient ski, smooth the sole with sandpaper, then rub in linseed oil and polish with floor wax.

If the skis do not rack straight, cut a groove in the bottom of the skis with a routing chisel. Do not rout out too much. A groove about 1/4-inch wide and 1/4-inch deep will do nicely to pack the snow under the ski and hold the user on his course.

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Build This Monorail Bathing Chute for Thrills

As a thrill producer, it will be hard to beat this monorail bathing chute. Erected on a hill sloping down to a beach, it will send you flying out into the water at a breathtaking speed. Construction is very simple.

BATHING weather prompts many novel means of sport in the water such as diving slides, swings, etc., but here is a regular “shoot the chute” in simplified form with which loads of sport can be obtained and all at a minimum cost.
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Mechanical Flying Goose Decorates Radiator Cap

For novelty in radiator ornaments, you’ll have to go a long way to beat this mechanical flying goose. As you speed along in your car, an ingenious arrangement of mechanism in the bird causes it to straighten out and flap its wings to simulate a real live goose in flight.

WHILE your car is standing still this wild goose isn’t so wild. He perches sedately upon the radiator cap surveying the world with a glassy eye. But as soon as you start up and shift into high he flattens out his tail, stretches his neck forward and begins to flap his wings as if he were going somewhere, and going there in a hurry. Read the rest of this entry »

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Approval Meter

BY SAMUEL KAUFMAN

WITH the “approval meter,” program directors will no longer have to rely on laughter, applause or boos to learn just what the audience thinks of entertainment.

The method—developed by Schwerin Research Corporation—works automatically and records reaction for study later. All you do is push or pull a tiny lever at your side.
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“Perpetual Motion” Machine Makes Novel Window Display

For novelty in window displays you can’t beat this “perpetual motion machine” as a means of attracting the attention of passers-by. Powered by magnets concealed in the tracks, the steel ball whirls round and round, bewildering those who pause to watch.

SCORES of people will walk right by an artistically decorated store window without giving the display a glance. On the other hand, another store window with a novel display catches the eye of every passer-by.
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SWAMI

As mystifying as the Indian rope trick, this magic marvel defies the laws of gravity.

PROBABLY Isaac Newton was right; but you couldn’t prove it with this gadget. It just seems to work contrary to all laws of gravity.

Swami, by itself, reacts like any other object: supported at one end only—it falls. But, add a fairly heavy belt, as shown in the photo, and it will not only stay up but actually take quite a bit of extra pressure to make it tilt down, even slightly.

We won’t tell you how or why it works. That is part of the mystery. Go ahead and make one and try to find out for yourself. You’ll be truly amazed.

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Animate Your Photographs

A pull on a string and this photo comes to life. To make this toy choose or make a photograph of your child (or even yourself) in a pose which shows the arms and legs suitably extended. Make two identical enlargements and glue these on thin Masonite or plywood.

Now you have two mounted prints; on one you will want to use only the torso, so mark off the legs and arms. Read the rest of this entry »

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Easter-Egg Zoo

BERTHE MARCHAND used her ingenuity. Needing something original for the Easter table—something for the children to admire—she hit on the idea of making an entire zoo of animals, using colored Easter eggs and other odd bits of material easily obtained for a few cents at any stationer’s.

Why don’t you do the same? It just takes patience, nimble fingers, and extreme care in handling the eggs— which can be dropped only once.
(Maybe you’d better boil them.)

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“Poor Man’s” Yacht

This floating dream-home will allow you to cruise the river in millionaire style.

By Rudy Arnold

HAVE YOU ever dreamed of cruising down the river in your own private yacht? If you have, now is the time to do it and enjoy the plushness of a modern dream-home complete with front and back yard.

Wesley H. Dyer’s “Dumbo” has made a low-cost family yacht a practical reality for the water-loving landlubber. Dyer, president of the Metal Products Company of Nashville, Tenn., named his original family yacht, shown on these pages, after Walt Disney’s flying elephant because his novel craft was big but surprisingly agile for its size. Read the rest of this entry »