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TRAIN at HOME for ElectricityThe NEW Shop-Laboratory Way

Big Shop Laboratory Worth $60.00 without Extra Cost.

Aviation, Talking Movies, Radio, Super-Power, Television, Refrigeration, Lighting.

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SO EASY IT’S SHOCKING, IF YOU USE ENLARGED PLANSto build electronic projects. Enlarged size, step-by-step craft print plans—complete with detailed materials lists—are available for the following:

191. TESLA COIL. Produces 70,000 volts at 500,000 cps. Spectacular but safe…………………………………$1.00

227. REPULSION COIL. Defies law of gravity—electromagnetically …………………………………………$1.00

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Compute—With PotsHow 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.

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Miniature Motor Made of Paper ClipsIn a few minutes’ time, from several paper clips and some fine insulated wire, you can make a little electric motor that will illustrate the principle of the big fellows. The outer field magnets are wound with about twelve feet of wire, and the same length is used to wind the two legs of the armature or rotor, as shown in the photos and diagram below. Sealing wax holds the two ends of the rotor winding to the shaft, forming a commutator. One or two dry cells will supply sufficient current to run the miniature motor, which spins merrily as long as power is supplied to it.