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for Amateurs

A Practical Treatise Showing the Construc-
tion and Winding of an Experimental
Fifty Watt Dynamo

By Arthur J. Weed

Member of the New York Electrical Society
Author of "Gas Engine Construction"

SCIENCE

Illustrated by sixty-four original engravings showing
the actual work in progress

New York

The Norman W. Henley Publishing Co.
132 Nassau Street

1910

Copyright, 1910, by

THE NORMAN W. HENLEY PUBLISHING CO.

NEW YORK

JUN 7 1911

то •WAI

PREFACE

THE little machine herein described was designed to furnish practical instruction for the electrical student and a very large number have been constructed for that purpose.

Being very small and light, they are especially valuable in class work, and are used for this purpose in some of the colleges and schools. The complete dynamo weighs but little more than five pounds, and is small enough to be passed around at a lecture as a practical illustration.

At many of the Manual Training Schools and State Colleges, the construction and winding of these little dynamos has formed a portion of the shop work of the students.

In efficiency, they are the equal of any small dynamo built and if the mechanical work is carefully and correctly done, the little machine can be put to practical use either in generating current or as a motor for light power.

They have been successfully used to furnish current to spark coils for gas-engine ignition, and a dozen of the machines fitted with special ball bearings, in a

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