er-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
compass 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
illustrations 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 illustrations 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

[Illustration]

These two outfits are similar in construction, although they differ in
details, each being designed for its special work. The "keys,"
"sounders" and "binding-posts" are neatly mounted upon ebonized bases
measuring 6-1/2x3-3/4 in., these also serving as sounding-boards.

"Fun with Telegraphy" is the original low-price telegraph outfit for
students that has sold by the thousands and given universal
satisfaction. It is considered the best 50-cent outfit ever produced,
and, although we have made several improvements lately, the price is the
same as before. In connection with a peculiar oscillating electro-magnet
and a queer anvil, the sounding-