The cover image was created by the transcriber and is placed in the public domain.
i
THE THOUGHT IS IN THE QUESTION THE INFORMATION IS IN THE ANSWER
HAWKINS
ELECTRICAL GUIDE
NUMBER
FOUR
QUESTIONS
ANSWERS
&
ILLUSTRATIONS
A PROGRESSIVE COURSE OF STUDY
FOR ENGINEERS, ELECTRICIANS, STUDENTS
AND THOSE DESIRING TO ACQUIRE A
WORKING KNOWLEDGE OF
ELECTRICITY AND ITS APPLICATIONS
A PRACTICAL TREATISE
by
HAWKINS AND STAFF
THEO. AUDEL & CO. 72 FIFTH AVE. NEW YORKii
COPYRIGHTED, 1914,
BY
THEO. AUDEL & CO.,
New York.
Printed in the United States.
iii
TABLE OF CONTENTS GUIDE NO. 4
DISTRIBUTION SYSTEMS697 to 720
Classification—series system—danger in series arclight system—constant current system—parallel system—arrangementof feeder and mains in parallel system—series-parallelsystem—center of distribution—Edisonthree wire system—evolution of the three wire system—balancedthree wire system—balancing of three wiresystem—copper economy in three wire systems—Dobrowolskythree wire system—modifications of threewire system—three wire storage battery system—threewire double dynamo system—three wire bridge system—threewire three brush dynamo system—Dobrowolsky threewire system—three wire auxiliary dynamo system—threewire compensator system—extension of the three wireprinciple—five wire system—dynamotor—connections ofbalancing set—balancing coils—distribution by dynamomotor sets—boosters and their uses—auxiliary bus bar.
WIRES AND WIRE CALCULATION721 to 764
Preliminary considerations—various wires—copper wire—ironwire—German silver wire—standard of copperwire resistance—relative conductivity of different metalsand alloys—conductors—cable for elevator annunciators—coveredconductors—rubber covered conductors—rubber insulatedtelephone and telegraph wires—weather proof conductors—twistedweather proof wires—precautions in usingweather proof conductors—slow burning wire; where used—slowburning weather proof wire; where used; how installed—miscellaneousinsulated conductors—safe carrying capacityof wire—pothead wires—circular mils—squaremils—mil foot—lamp foot—ampere foot—center ofdistribution—wire gauges—B. & S. standard wiregauge—micrometer screw gauge—calculating gauge—tableof various wire gauges—table of lamp feet forivrubber covered wires—lamp table for weather proofwires—symmetrical and unsymmetrical distribution—wiringtable for light and power                         
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