PRACTICAL ELECTRICAL ENGINEERING - Internet Archive

PRACTICAL

ELECTRICAL ENGINEERING

DIRECT CURRENTS

A MANUAL FOR USE IN INDUSTRIAL AND EVENING

SCHOOLS AND FOR HOME STUDY

BY

HARRY a. CISIN, M. E.

ENGINEERING EDITOR, ""ELECTRICAL RECORD"

68 ILLUSTRATIONS

NEW YORK

D. VAN NOSTRAND COMPANY

EIGHT WARREN STREET

1922

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COPYRIGHT, 1922

BY D. VAN NOSTRAND COMPANY

Printed in the United States of America

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PREFACE

This book was written for the use of Industrial and Eve

ning schools and also as a home-study text. The basic princi

ples of direct-current electrical engineering are presented,

the keynote being simplicity. The only requisite for a full

comprehension of the text is a knowledge of simple arithme

tic, for mathematical derivations and proofs are dispensed

with. This book is the only one, within the author's knowl

edge, on this phase of electrical engineering which does not

use symbols and does not require a knowledge of algebra.

The course gives a correct and definite conception of the

principles forming the foundations of electrical engineering.

It is laid out according to a specific and logical plan. First,

the fundamental units of the "practical" system are de

fined and explained. It is necessary for the student to learn

and memorize these units as they will be used continually

and will serve as his tools. It is then necessary to become ac

quainted with the fundamental laws of electrical engineering.

Having mastered these, the student is ready to attack the

more difficult problems which arise. After the fundamental

laws, the properties of electrical and magnetic circuits are

discussed. Under this heading (lesson 3) the author has

endeavored to present the subject of "Current-Carrying

Capacity" in a thorough and novel manner. When this much

of the text has been mastered, the student has a sure ground

work. Electrical instruments are next taken up. Instead

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