How to MULTIPLY, DIVIDE, ADD and SUBTRACT with simple potentiometer circuits.
WHEN we think about arithmetic, we think about addition, subtraction, multiplication and division. Algebra extends the usefulness of arithmetic by employing symbols for quantities. Trigonometry brings into play the relationship between sides and angles of triangles. Using one or more of these three mathematical approaches, most of the design problems encountered in electronic equipment can be solved.
INDOOR-OUTDOOR DINING TABLE
This modern table and bench set is easy to construct and goes equally well in the garden or breakfast room.
By John Harter
IF you’re the type of person who appreciates the clean, trim lines of today’s functional design, this table and bench set is for you.
The coolest cats dig the solid beat of this crazy, mixed-up tub.
By Ron Anderson
A BASS violin is something you’re not likely to have around the house. Yet the beat of such an instrument adds rhythm to any musical get-together. Here’s one to make that will produce deep, boomy tones comparing favorably with the real thing.
Voting Machine for Young Citizens
YOU can teach your children to be good citizens with this voting machine scaled down to neighborhood size. Rotary, Kiwanis and Lions clubs, youth organizations or junior groups can run a mock election to prepare for adult citizenship—and the clubs can use the machine for real elections of their own officers and leaders.
The fine art of cutting precious and semi-precious stones isn’t confined to professionals. It’s also a fascinating and interesting hobby.
BY ANN COLBERT
ONE answer to the question “What kind of jobs can disabled veterans do?” has been given by Matthew and Daniel Rosenthal, who have trained many of them as lapidaries. The Rosenthal brothers are the owners of the Gabriel Williams Company, N. V. research laboratories with an impressive record in the fields of electronics, physics, color design and internal combustion engines.
PUSHBUTTON BEACH CLIMBER
These Long Islanders live only 200 feet from the beach—by their own funicular railroad.
SLIDING down and climbing up a 200-foot, 45-degree sand bluff is fun for the kiddies but poor sport for the whole family—especially if it’s required activity. Anyway, that’s the way engineer Zvi Gezari felt about the only approach to the Long Island Sound beach near his home.
After two thousand years modern design is applied to the old game of chess.
CHESS, going back into ancient history, got its present name from the Persian word, Shah, meaning King.
Its origin has been ascribed to the Greeks, Romans, Babylonians, Scythians, Egyptians, Persians, Chinese, Hindus, Arabians, Irish, Welsh and the Castilians, and it is mentioned in history as far back as 200 B.C.
I like how it states that all of the stunts are harmless then proceeds to explain all the ways the ingredients are not.
Mystifying With Chemical Magic
WHILE all stunts described above are harmless, care should be exercised in the handling of the phosphorous and sulphuric acid (H2S04). Phosphorous when exposed to open air for periods longer than two minutes will burst into flame, therefore submerge it in kerosene when not in use. To protect your fingers from its effects powder them with chalk or talcum. A pair of small forceps may be also used, if available, in handling small pieces of the chemical. In handling the sulphuric acid be sure that none drops on clothing as it rots material.
I’m not sure that this would work very well… Not to mention building it the middle of a river with a decent current would be less than easy.
A Water-Driven Ferris Wheel for the Camp
By D. R. VAN HORN
THE chief merit of the amusement device shown in the drawing is the fact that it will give the users alternate sun and water baths as long as they wish and without effort on their part. Because of this wholesome fun and the simplicity of design the wheel is a desirable addition to any summer camp situated on a stream with sufficient current to operate it.
Old Hats Make New Rugs
By ELEANORE ENGELS
Photos by Wally Kunkle
THERE are many kinds of felt rugs, but we will discuss only 3 in this article: the tongue or petal rug (Figs. 1, 4 and 6)—sometimes called the scalloped doormat—the appliqued felt rug (Fig. 10) and the embroidered felt rug. These needlework floor coverings require no special frames, hooks, or gadgets. All you need is a long, stout needle (somewhat slimmer than a darning needle so that it slips through the felt easily), heavy waxed linen or cotton thread, and wool yarns taken from old sweaters and socks, knitting silks, or crochet cottons for decorative effects.