THE LIBRARY OF WORK AND PLAY
Electricity and Its Everyday Uses
THE LIBRARYOF WORK AND PLAY
| Carpentry and Woodwork |
| By Edwin W. Foster |
| Electricity and Its Everyday Uses |
| By John F. Woodhull, Ph.D. |
| Gardening and Farming |
| By Ellen Eddy Shaw |
| Home Decoration |
| By Charles Franklin Warner, Sc.D. |
| Housekeeping |
| By Elizabeth Hale Gilman |
| Mechanics, Indoors and Out |
| By Fred T. Hodgson |
| Needlecraft |
| By Effie Archer Archer |
| Outdoor Sports, and Games |
| By Claude H. Miller, Ph.B. |
| Outdoor Work |
| By Mary Rogers Miller |
| Working in Metals |
| By Charles Conrad Sleffel. |
The Library of Work and Play
ELECTRICITY AND ITS
EVERYDAY USES
BY JOHN F. WOODHULL, PH.D.
McGOWEN-MAIER & CO.
Chicago, Ill.
ALL RIGHTS RESERVED, INCLUDING THAT OF TRANSLATION
INTO FOREIGN LANGUAGES, INCLUDING THE SCANDINAVIAN
COPYRIGHT, 1911, BY DOUBLEDAY, PAGE & COMPANY
PREFACE
Why do we pursue one method when instructingan individual boy out of school, and a verydifferent method when teaching a class of boys inschool?
The school method of teaching the dynamo isto begin with the bar magnet and, through a seriesof thirty or forty lessons on fundamental principles,lead up to the dynamo, which is then presented, withconsiderable attention to detail, as a compositeapplication of principles. This might be styledthe synthetic method. He who teaches a boy outof school is pretty likely to reverse this order andpursue the analytic method. The class in schoolhas very little influence in determining the orderof procedure. The lone pupil with his questionsalmost wholly determines the order of procedure.Out of school no one has the courage to deny informationto