A STATIC MOTOR.
This is a motor operated by the electricity from a static machine. It does not possess any appreciable amount of power and must be very carefully built and balanced in order to operate.
It consists of four celluloid "ping-pong" balls, B, B, B, B, covered with tinfoil and mounted on opposite ends of two wooden spokes. The balls should be at right angles to each other as shown in the illustration. The spokes pass through a cork. The cork is mounted on a wire spoke or knitting needle passing through its centre and supported in small notches in the top of two upright wooden bearings. The device must be very carefully balanced so that the slightest impulse will cause it to spin and so that there will not be any dead centre.
The upright bearings are mounted on a wooden base. Two other tinfoil covered balls A, A, are supported on glass or rubber insulating rods at opposite ends of the base on a level with the axle and in such a position that the balls B, B, B, B, almost touch A and A as they swing past.
[Illustration: FIG. 194.—The Static Motor.]
Connect A and A each to one discharger rod on the Wimshurst machine. Start the machine and give the axle of the static motor a twist. As the balls B, B go past A and A they will receive a charge of electricity which will cause them to repel each other until they have swung past the other ball on the opposite side and discharge their electricity in return for a charge of the opposite sign.
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COLE & MORGAN
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P.O. Box 473 New York, N. Y.
*The Boy Electrician*
Practical Plans for Electrical Toys and Apparatus, with an Explanation
of the Principles of Everyday Electricity.
*By ALFRED P. MORGAN.*
Author of "Wireless Telegraph Construction for Amateurs" and "Wireless
Telegraphy and Telephony," etc.
*With full-page Illustrations and 324 Working Drawings and Diagrams*
*by the author. 8vo., Cloth, Net Price, $2.00.*
This is the age of electricity. The most fascinating of all books for a boy must therefore be one dealing with the mystery of this ancient force and modern wonder, even a mere list of whose services is impossible. The best qualified of experts to instruct boys, Alfred P. Morgan, has in a book far superior to any other of its kind told not only how to make all kinds of motors, telegraphs, telephones, batteries, etc., and to do so economically, but has explained the principles upon which these depend for operation, and how the same thing is done in the every-day world be well presented and so attractive is this really great book that it will be an education for any bright boy to have it, as well as the best kind of a moral safeguard, by leaving no time or thought for evil, and a means of future benefit beyond the power of any one to reckon. Glancing over the pages of this book, one cannot but be impressed by the excellent illustrations, clearness of expression and the large number of subjects that are covered. It is beyond doubt the best book in this line that has ever been written or published. It is a book that will delight every boy who has a leaning towards electrical experiments. The author writes in a clear and chatty style and while he has a thorough technical knowledge of his subject he has succeeded in treating it in a simple manner so that it is readily intelligible to his young readers.
*Among the Chapter Headings and Contents are:*
Magnets and Magnetism—Static Electricity—Static Electric Machines—Cells
and Batteries—Electro-Magnetism and Magnetic Induction—Electrical
Units—Electrical Appurtenances—Electrical Measuring Instruments—Bells,
Alarms and Annunciators—Electric Telegraphs—Microphones and
Telephones—Induction Coils—Transformers—Wireless Telegraphy—Wireless
Telephony—Electric Motors—Dynamos—An Electric Railway—Miniature
Lighting—Miscellaneous Electrical Apparatus.
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"A great book for enterprising boys. Bright boys will highly appreciate it and feel like thanking the wideawake publishers for putting such a reliable and interesting work in the field."—New Haven Journal.
"The book covers the subject of electricity thoroughly in all its phases and is a splendid acquisition to any boy’s library."—Detroit Times.
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"This is an admirably complete and explicit handbook for young boys who fall under the spell of tinkering with electrical apparatus."—Boston Transcript.
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*Experimental Wireless Construction*
*EIGHTY-SIX PAGES NINETY-THREE ILLUSTRATIONS*
*Only 25 Cents, Postpaid*
Here at last is the book which every young experimenter interested in constructing his own wireless apparatus has been looking for.
A book which tells how to build apparatus which anyone would be proud to own. It is a more advanced book than "Wireless Construction and Installation for Beginners," and describes apparatus which is much more elaborate and sensitive. The instruments have all been the subject of considerable experimental work and study. All the apparatus has been put to practical test and carefully improved by clever experts. By purchasing this book you get the benefit of vast knowledge and experience and are enabled to build far better instruments than by following your own designs and haphazard methods.
THE TREMENDOUS POPULARITY OF THIS VALUABLE LITTLE BOOK IS ONLY AN INDICATION OF ITS GREAT WORTH.
It has only been on the market a short time, yet the sales will undoubtedly soon reach a point which would indicate that experimenters unquestionably consider, that in proportion to its size, it is the best book on the market.
It does not describe any old or obsolete forms of wireless apparatus but only the latest types of aerials, spark coils, keys, gaps, condensers, helixes, oscillation transformers, loose couplers, tuning coils, detectors, loading coils, variable condensers, aerial switches, etc.
IT IS ONE OF THE MOST DETAILED AND THOROUGH BOOKS EVER PUBLISHED.
The information is all intensely practical. Complete directions and dimensions are given. Nothing is left to be guessed at. The book must really be seen to be appreciated.
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