Electricity for Boys   By: James Slough Zerbe (1850-)

ELECTRICITY FOR BOYS

[Illustration: Fig. 1. WORK BENCH]

THE "HOW TO DO IT" BOOKS

ELECTRICITY FOR BOYS

A working guide, in the successive steps of electricity, described in simple terms

WITH MANY ORIGINAL ILLUSTRATIONS

By J. S. ZERBE, M.E.

AUTHOR OF CARPENTRY FOR BOYS PRACTICAL MECHANICS FOR BOYS

[Illustration: Printer's Mark]

THE NEW YORK BOOK COMPANY NEW YORK

COPYRIGHT, 1914, BY THE NEW YORK BOOK COMPANY

CONTENTS

INTRODUCTORY Page 1

I. ELECTRICITY CONSIDERED. BRIEF HISTORICAL EVENTS Page 5

The Study of Electricity. First Historical Accounts. Bottling Electricity. Discovery of Galvanic Electricity. Electro motive Force. Measuring Instruments. Rapidity of Modern Progress. How to Acquire the Vast Knowledge. The Means Employed.

II. WHAT TOOLS AND APPARATUS ARE NEEDED Page 11

Preparing the Workshop. Uses of Our Workshop. What to Build. What to Learn. Uses of the Electrical Devices. Tools. Magnet winding Reel.

III. MAGNETS, COILS, ARMATURES, ETC. Page 18

The Two Kinds of Magnets. Permanent Magnets. Electro Magnets. Magnetism. Materials for Magnets. Non magnetic Material. Action of a Second Magnet. What North and South Pole Mean. Repulsion and Attraction. Positives and Negatives. Magnetic Lines of Force. The Earth as a Magnet. Why the Compass Points North and South. Peculiarity of a Magnet. Action of the Electro Magnet. Exterior Magnetic Influence Around a Wires Carrying a Current. Parallel Wires.

IV. FRICTIONAL, VOLTAIC OR GALVANIC AND ELECTRO MAGNETIC ELECTRICITY Page 29

Three Electrical Sources. Frictional Electricity. Leyden Jar. Voltaic or Galvanic Electricity. Voltaic Pile; How Made. Plus and Minus Signs. The Common Primary Cell. Battery Resistance. Electrolyte and Current. Electro magnetic Electricity. Magnetic Radiation. Different Kinds of Dynamos. Direct Current Dynamos. Simple Magnet Construction. How to Wind. The Dynamo Fields. The Armature. Armature Windings. Mounting the Armature. The Commutator. Commutator Brushes. Dynamo Windings. The Field. Series wound Field. Shunt wound. Compound wound.

V. HOW TO DETECT AND MEASURE ELECTRICITY Page 49

Measuring Instruments. The Detector. Direction of Current. Simple Current Detector. How to Place the Detector. Different Ways to Measure a Current. The Sulphuric Acid Voltameter. The Copper Voltameter. The Galvanoscope Electro magnetic Method. The Calorimeter. The Light Method. The Preferred Method. How to Make a Sulphuric Acid Voltameter. How to Make a Copper Voltameter. Objections to the Calorimeter.

VI. VOLTS, AMPERES, OHMS AND WATTS Page 60

Understanding Terms. Intensity and Quantity. Voltage. Amperage Meaning of Watts and Kilowatt. A Standard of Measurement. The Ampere Standard. The Voltage Standard. The Ohm. Calculating the Voltage.

VII. PUSH BUTTONS, SWITCHES, ANNUNCIATORS, BELLS AND LIKE APPARATUS Page 65

Simple Switches. A Two Pole Switch. Double Pole Switch. Sliding Switch. Reversing Switch. Push Buttons. Electric Bells. How Made. How Operated. Annunciators. Burglar Alarm. Wire Circuiting. Circuiting System with Two Bells and Push Buttons. The Push Buttons, Annunciators and Bells. Wiring Up a House.

VIII. ACCUMULATORS, STORAGE OR SECONDARY BATTERIES Page 82

Storing Up Electricity. The Accumulator. Accumulator Plates. The Grid. The Negative Pole. Connecting Up the Plates. Charging the Cells. The Initial Charge. The Charging Current.

IX. THE TELEGRAPH Page 90