Essentials of electricity : a textbook for wiremen and the electrical trades : direct currents

Essentials of electricity : a textbook for wiremen and the electrical trades : direct currents

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Presented to the LIBRARY theof UNIVERSITY OF TORONTO by Mrs. G. R. Cooke THE WILEY TECHNICAL SERIES FOR VOCATIONAL AND INDUSTRIAL SCHOOLS EDITED Br J. M. JAMESON QIRARD COLLEGE rOBlCSBLT PBATT INBTITTm ESSENTIALS OF ELECTRICITY THE WILEY TECHNICAL SERIES EDITED BY JOSEPH M. JAMESON TEXT BOOKS IN ELECTRICITY NOW READY Industrial Electricity. Direct-Current Machines. By W. H. Timbtb, Professor of Electrical Engineering and Industrial Practice, Massachu- setts Institute of Technology. xiii 735 "pages, by 8.+ 5J 469 figures. Cloth, $3.50 net. Answers to Problems in Industrial Electricity. 5 by Paper,7i. 50 cents net. The Elements of Electricity. By W. H. TiMBiE, ^Iassachusetts Institute of Technology. Second Edition, Completely Rewritten, xi 624 pages, by 8.-f- 5i 437 figures. Cloth, $3.50 net. Answers to Problems in Elements of Electricity. 5 by Paper, 50 cents net.7i. The Electricity.Essentials of Wiremen and the ElectricalA Text-book for Trades. By Massachusetts Institute of Technology.W. H. TiMBiE, pocket size, xiii -1-271 pages, 5 by 224Flexible covers, 7i. |l.75 net.figures. Cloth, Essentials of Electricity.Answers to Problems in 25 cents net.6 by Paper,7i. Alternating Current Machinery.Continuous and Moheckoft,By Professor J. H. Columbia University, ix -1-466 pages, 5} by 71. 288 figures. Cloth, $2.76 neroents and By Chester L. Dawes, Assistant Professor of Electrical En- gineering, The Harvard Engineering School. 39 exercises, 8 by 10§.

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Presented to the
LIBRARY theof
UNIVERSITY OF TORONTO
by
Mrs. G. R. CookeTHE WILEY TECHNICAL SERIES
FOR
VOCATIONAL AND INDUSTRIAL SCHOOLS
EDITED Br
J. M. JAMESON
QIRARD COLLEGE
rOBlCSBLT PBATT INBTITTm
ESSENTIALS OF ELECTRICITYTHE WILEY TECHNICAL SERIES
EDITED BY
JOSEPH M. JAMESON
TEXT BOOKS IN ELECTRICITY
NOW READY
Industrial Electricity.
Direct-Current Machines. By W. H. Timbtb, Professor of
Electrical Engineering and Industrial Practice, Massachu-
setts Institute of Technology. xiii 735 "pages, by 8.+ 5J
469 figures. Cloth, $3.50 net.
Answers to Problems in Industrial Electricity. 5 by Paper,7i.
50 cents net.
The Elements of Electricity.
By W. H. TiMBiE, ^Iassachusetts Institute of Technology.
Second Edition, Completely Rewritten, xi 624 pages, by 8.-f- 5i
437 figures. Cloth, $3.50 net.
Answers to Problems in Elements of Electricity.
5 by Paper, 50 cents net.7i.
The Electricity.Essentials of
Wiremen and the ElectricalA Text-book for Trades. By
Massachusetts Institute of Technology.W. H. TiMBiE,
pocket size, xiii -1-271 pages, 5 by 224Flexible covers, 7i.
|l.75 net.figures. Cloth,
Essentials of Electricity.Answers to Problems in
25 cents net.6 by Paper,7i.
Alternating Current Machinery.Continuous and
Moheckoft,By Professor J. H. Columbia University,
ix -1-466 pages, 5} by 71. 288 figures. Cloth, $2.76 ne<.
Continuous and Alternating Current Machinery Problems.
Engineer-By W. T. Ry.\n, E.E., Professor of Electric Power
ing, The University of Minnesota. 40 pages, by 7f.5J
centsCloth, 50 net.
Electrical Measurements.
InstituteD. and A. ByW. H. Timbib, MaasachusettaC. C.
of Technology. Loose Leaf. 8 by lOJ. Complete, paper
cover, 85 cents net.
Elementary Electrical Testing.
By Professor V. Karapetoff, Cornell University. Loose
_
leaf or bound in paper cover. 8 by lOJ. Complete,
60 cents net.
Alternating Current Electricity and its Application to Industry.
Institute ofFirst Course. By W. H. Timbie, Massachusetts
of ElectricalTechnology, and H. H. Higbie, Professor
Michigan. byEngineering, University of x-}-634 pages, 6J
8. 389 figures. Cloth, $3.50 net.
Industry,Alternating Current Electricity and Its Application to
InstituteSecond Course. By W. H. Timbie, Massachusetts
Professor of Electricalof Technology, and H. H. Higbie,
Michigan, ix 4-729 pages,Engineering, University of
by 8. 357 figures. Cloth, $4.00 net.5i
Answers to Problems in Alternating Current Electricity.
First and Courses. Paper cover, 50 cents net.Second
Electrical Testing.Measur«>roents and
By Chester L. Dawes, Assistant Professor of Electrical En-
gineering, The Harvard Engineering School. 39 exercises, 8
by 10§. Complete in paper cover (removable' leaves). 75
.cents net.
Essentials of Alternating Currents.
By W. of Technology,H. Timbie, Massachusetts Institute
pages.and H. Michigan, x -1-374H. Higbie, University of
8 by net.7. 223 figures. Cloth, $2.25
Answers Currents.to Problems in Essentials of Alternating
Paper, 25 cents net.
Mathematics for Electrical Students.
andBy of Department of Mathematics,H. M. Keal, Head
TechnicalInstructor in Mathematics, CassC. J. Leonard,
165-1-230 pages. 4} by 7.High School, Detroit. vii
net.figures. Cloth, $1.60ELECTRICITYOFESSENTIALS
FORTEXTBOOKA
WIREMEN
ELECTRICAL TRADESAND THE
CURRENTSDIRECT
BY
W. H. TIMBIE
ExoiXEERiNa axo Dn>xnTBiAi> pbacticb,ranraoaoB or blectbical
MAItAfHIIHBI'HI lUBTrrUTB OF TBCHHOLOOT
TOTAL ISSUE NIN£TT-SEVSN THOUSAND
NEW YORK
WILEY & SONS IkcJOHN
CHAPMAN & HALL, LiMmoLoinxw::: : :
Copyright, 1913,
TIMBIEBy W. H.
WORKS OF W. H. TIMBIE
PUBLISHED BT
JOHN WILEY & SONS, Inc.
Fourth Avenue, New York440
Industrial Electricity i
Direct-Current Machines, xiii + 735 pages,
469 figures. Cloth, .50 net.by 8, S35i
to Problems in Industrial ElectricityAnswersLI3R
Paper, 50 cents net.5 bj' 7i.
Elements of Electricity:The
For Technical Students. Second Edition, Com-
pletefy Rewritten. ix-|-624 pages, by 73^, 4375M
figures. Cloth, $3.50 net.
Answers to Problems in Elements of Electricity;K
Paper, cents net.5 14, by 7 }4- 50
The Essentials of Electricity
A Text-book for Wiremen and the Electrical
Trades. Flexible cover, pocket size, xiii-i-271
pages, 5 by 7 224 figures. Cloth, $1.75 net.
. J4,>>
Ahswers to Problems in Essentials of Electricity:
' 5by7M. Paper, 25 cents net.
andElectrical Measurements in Direct Alternating
Currents
"manual accompany the Ele-A laboratory to
and the "Essentials." Loose leaf, byments" 8
bound in paper cover. 85 cents net.10 orJ/2>
TIMBIE AND H. H. HIGBIEBy W. H.
Alternating-current Electricity and its Application to
Industry
ByW. H. TiMBiE and H. H. Higbie, Professor of
Electrical Engineering, University of Michigan.
7i^,First Coubse. x-(-535 pages, SJi by 389
figures. Cloth, $3.50 net.rfs Second Course, ix+729 pages, 514 by 7H.
357 figures. Cloth, $4.00 net.
ProblemsAnswers to in Alternating-current Elec-
tricity :
and Second Courses, ii+30First pages,
cents net.5 by Paper, 507K-
of Alternating Currents:Essentials
viii+374 pages, 5 by 223 figures.7, Cloth,
$2.25 net.
Answers to Problems in Essentials of Alternating
Currents:
6 by 7. Paper, 25 cents net.
By W. H. TIMBIE AND VANNEVAR BUSH
Principles of Electrical Engineering:
Timbie VannevarBy W. H. and Bush, Pro-
fessor of Electric Power Transmission, Massa-
chusetts Institute ofTechnology, viii-H513pages.
5 by 75^,244 figures. Cloth, $4.00 net.}i
Problems Principles ofAnswers to in Electrical
Engineering:
Paper, cents net.5 by 7 }^. 50
By MOYER AND TIMBIEA. W. H.J.
Practical Electricity:
By James A. Moter, Director of the Massachu*
setts Department of University Extension, and
W. H. TiMBiE. Instruction material for home
study. Seven pamphlets. Paper, per set, $3.00
net.
4-26
Printed in U. S. A.PREFACE
The following brief text was developed from notes which
author has been using inthe short trade courses for students
who wish to enter or to advance themselves in one or
another of the electrical trades. It attempts to explain
underlying factsthe and laws of good electrical practice,
which the really well-informed and efficient workman must
understand, rather than to provide book descriptions of
the mechanical operations of the electrical trades, which
can be really learned only through continued practice in
performance.their It is designed to be a systematized
for classtext and self-instruction, and, also, a book of
electrical information to which frequent reference may be
made during the day's work. For convenience in the latter
purpose, it is bound in pocket sizea and with semiflexible
covers.
As is implied in the title, only such material has been
included in the text as is regarded to be absolutely essen-
tial to the object in view. The order in which the various
topics are taken up is that which the author has found to
be most teachable. The method of presentation is de-
signed both to arouse and hold interest, and to furnish
the easiest approach to new or more difficult ideas. Foi
this reason, the author's plan is to build outward, and by
very small steps, from the starting point of the reader's own
experience in the commercial shop or the school laboratory.
Students in short trade courses must acquire a large fund
of information in an extremely short time. cannotThis be
accomplished by increasing the size of the mental stepsviii PREFACE
the student must take, but rather by shortening and by
properly arranging these steps, until he can pass most surely
from one conception to the next in order. Inand rapidly
the numerous simple diagrams and thethis connection,
direct and practical problems be foundlarge number of to
prove most helpful.in the book will
this expressIn conclusion, I wish to take opportunity to
Williston,my appreciation and thanks to Mr. Arthur L.
Jameson,Principal of Wentworth Institute, and Mr. J. M.
whichPratt Institute, for the incentive and valuable aid
of this text.they have rendered throughout the preparation
Grateful acknowledgement is also extended to my col-
leagues, Prof. H. H. Higbie and Mr. W. J. Mayo, for many
valuable criticisms and suggestions.
TIMBIE.W. H.
Newtonville, Mass.,
November, 1912.