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Mention Technical IV orld Maggrine

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The King of all. The Companion volume to Modern Wiring Diagrams


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Contains hundreds of easy up-to-date tables covering everything on Electric
Wiring. Bound in full Persian Morocco. Pocket size. Round corners, red edges.

PRICE, NET, $1.50
Tables for direct current calculations. Tables for alternating current calculations.

These tables show at a glance the currents required with any of the systems in
general use, for any voltage, efficiency, or power-factor, and by a very simple cal.

culation (which can be mentally made) also the proper wire for any loss. Tables showing

the smallest wire permiesible with any system or number of H. P. or lights under“National Electrical Code.". Very convenient for Contractors, Tables for calculating the most economical loss. Tables and diagrams showing the proper size of conduits to accommodate all neces

sary combinations or numbers of wires.
Tables and data for estimating at a glance the quantity of material required in

different lines of work.
As this is intended for a pocket hand-book overything

that would make it un. necessarily cumbersome has been omitted. There is no padding. Every page 18 valuable and a time saver. This book can be used every day by the wire-man, the

con. tractor, engineer and architect. All parts are so simple that very little knowledge is required to understand them.

OTHER IMPORTANT WORKS BY THESE AUTHORS Modern Wiring Diagrams & Descriptions, price

$1.50 Modern Electrical Constructions, price

$1.50 The 3 above volumes in a box. Special price complete,

If any of these books are not worth ten times the amount asked, return them and get
your money back. Sent all charges prepaid to any address upon receipt of price.

Our 1907 Catalogue now ready. Sent free.
FREDERICK J. DRAKE & CO., Publishers,
In ordering ple a se mention t h i s paper

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350-352 Wabash Ave., CHICAGO, U. S. A.

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By Harbord and Hall, in the Metallurgical Series Edited by W. Roberts-Austen


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Containing 758 pages, 37 folding plates, 100 microsec-
tions from photographs, and 270 illustrations in the text,

THE OBJECT of the present work is to furnish a full description

of the various branches of steel manufacture, both
from a metallurgical and an engineering standpoint, as well as to discuss the
physics and chemistry of steel in relation to its manufacture. The work has been
divided into four sections: the Manufacture of Steel, Reheating, the Mechanical
Treatment of Steel, and Finished Steel





Mention Technical World Magazine

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THE UNIVERSITY OF CHICAGO Offers “ CORRESPONDENCE COURSES ” in over 30 academic and semi-professional subjects for Teachers, Writers, Social Workers, Bankers, Railway Men and Students desiring to finish either a High School or College course. One-half the work for an A, B., Ph. B., or S. B. degree may be done by correspondence. Work may begin at any time. THE UNIVERSITY OF CHICAGO, DEPT. H,


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