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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 permissible 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 glanco the quantity of material required in

different lines of work.

As this is intended for a pocket hand-book everything 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,

$4.00 OUR GUARANTEE 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,

or der ing ple a se mention this paper

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






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


Containing 758 pages, 37 folding plates, 100 microsec-
tions from photographs, and 270 illustrationsin 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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50 Cents Reference Library

Secures this GREAT
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This magnificent work-costing $750,000 to produce-is a Dictionary and an Encyclopedia combined. In fullness of definitions, number of words defined and accuracy, it is superior to reference works selling for five times its price. We have obtained a limited number of sets which we will close out at half price on the easy monthly-payment plan. We send the complete work to your home for examination, without charge, and if you decide to keep it a first payment of 50 cents secures a set-to be paid for while you are using it.

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If you mail the coupon below at once we will give you, absolutely free of charge, a splendidly bound 1906 Atlas of the World. "This Modern Atlas'' is 10x13 inches in size and contains 100 maps in six to twelve colors. It gives separate maps of all states and territories and all countries of the world. It was printed in the fall of 1906 and is thoroughly up-todate. Its price is $5.00, but if you reply promptly you can have it free.

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The set contains 5,000 pages, 250,000 words, 3,000 illustrations, and 50,000 encyclopedic articles. There are three styles of Þindingfull sheep, half-leather, and fine library cloth. We recommend the half-leather for ordinary use, and the full sheep for those who desire a set bound in luxurious style. In printing, paper, illustrations, and binding, this work is so nearly perfect that it is worthy of a place in the library of the most fastidious book-lover.

Greatest Dictionary Bargain Ever Offered As a Dictionary this work defines 25,000 more words than any other Dictionary and every definition is so clear a school boy can understand it.

As an Encyclopedia it treats 50,000 subjects in an encyclopedic manner and this vast array of articles covers the whole field of buman

knowledge. The limited edition that we control will be closed out

-MAIL THIS COUPON to prompt purchasers at slightly more than one-third the

AMERICAN NEWSPAPER ASSOCIATION, New York: publishers' price. For instance, the half-morocco bind

You may send me for inspection one set of the NEW ing-our price $20.50—has been widely sold at $56.00 a AMERICAN ENCYCLOPEDIC DICTIONARY, bound in the style

indicated by having the "X" beside. set, and it is considered by expert judges to be worth the

Full Sheep Binding. Regular price 864.00. I will pay for money. Prompt action on your part is necessary to be the same, it I decide to keep the books, as follows: 50

cents after I examine them and $2.00 a month until your sure of a set on these terms.

special price of $25.00 is paid. Cut out the coupon and mail it to us at once. We will Hall Leather Binding. Regular price 666.00.

will pay

for the same, if I decide to keep the books, as follows: 50 send you a complete set at OUR expense, to be returned

cents after I examine them and $1.50 a month until your if not satisfactory. Remember, if your

order is received special price of $20.50 1s paid. at once, you will get the Atlas free. Payments are 50

Library Cloth Binding. Regular price $42.00. I will pay for the same, if I decide to keep the

books, as follows: 60 cents upon acceptance of the books, and $1.25, $1.50 or cents after I examine them and $1.25 a month until your

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Mention Technical World Magazine


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Mention Technical World Magazine

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