Part 21 (1/2)

Don't simply read about motors--get right down to the practical part of it and experiment for yourself. Every experiment will settle an important point in your mind.

ELECTRIC MOTOR OUTFIT No. 2226X contains everything needed for sixty interesting and profitable experiments. With the improved apparatus that we now give we feel that this is the most complete set ever sold for the money. The following articles are included, packed in a wooden box:

THE ”ST. J.” MOTOR, fully described on another page, is well called ”A motor that can do things.”

THE FIVE-POINT RHEOSTAT is used as a ”starting-box” in the armature-circuit and in various other ways to regulate speed. (See cut.)

THE ELEVEN-POINT RHEOSTAT is used to regulate the ”field-magnetism,” as one method of speed-regulation, and for other purposes. (See cut.)

THE DOUBLE-KEY CURRENT REVERSER is, really, a key, a two-point switch, and a current-reverser combined. On this account it can be used in many ways, shown in numerous wiring-diagrams. (See cut.)

THE HANDY CURRENT-DETECTOR is used as a current-detector and as a device for studying the counter-electromotive force of motor while running.

THE TWO-POINT SWITCH is useful in quickly switching the current wherever it is needed, and for many other experiments.

THE STRAP KEY protects the batteries and closes the circuit.

THE MINIATURE ELECTRIC LAMP AND SOCKET are used in the motor-circuit to prove certain things and form an attractive addition to the outfit.

THE MAGNETIC NEEDLE in the new outfits is nickel-plated and serves as a compa.s.s for studying the magnetism of the poles, etc.

IN ADDITION to the articles mentioned above, the outfit contains a Set of Wires for Connections, a Box of Iron-Filings for studying lines of force, an Experimental Package containing Iron, Steel, etc., three Connecting-Wires, and

THE BOOK OF INSTRUCTIONS, called ”The Study of Electric Motors by Experiment.” This contains 10 chapters, 110 pages, and over 70 ill.u.s.trations and diagrams. Bound in stiff paper.

BATTERIES are not included, unless ordered extra. Three of our No. 1101 batteries cost 36c., and extra postage for 2 lbs.

No. 2226X--Complete Motor Outfit, as above (P. weight, 3 lbs.) $3.75

THE STUDY OF ELECTRIC MOTORS BY EXPERIMENT

contains Sixty Experiments that Bear Directly upon the Construction, Operation, and Explanation of Electric Motors, together with Much Helpful Information upon the Experimental Apparatus Required. This book will be a great help to those who want to do real experimental work with motors. It contains 10 chapters, 110 pages, over 70 ill.u.s.trations and diagrams, and you can not afford to be without it.

No. R57P--”Study of Motors,” bound in paper, postpaid $0.35

No. R57C--”Study of Motors,” bound in cloth, postpaid $0.60

Fun With Telegraphy (PATENTED)

TWO GREAT OUTFITS FOR STUDENTS

[Ill.u.s.tration]

These two outfits are similar in construction, although they differ in details, each being designed for its special work. The ”keys,”