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ENGINEERING COURSES BY CORRESPONDENCEMECHANICAL DRAWING ELECTRICAL ENGINEERING

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Appeals to the young man not only as a remunerative occupation but as a fascinating study. Some of America's greatest men started in their careers as telegraphers. Let us show you how to fit yourself for this wider field of usefulness. Write Now for our free 200-page book describing our courses in Telegraphy.

LOCOMOTIVE ENGINEERING

Any ambitious young man who loves to put his hand on the throttle should learn the theory as well as the practice. There is no work so full of fascination, nor where the work is steadier. Write to-day for our 200-page book describing this and 60 other courses.

STATIONARY ENGINEERING

Every new skyscraper opens up new opportunities for the Stationary Engineer. Let us give you some advice on the subject of Stationary Engineering and send you our 200-page book, giving a synopsis of the Course. Write to-day.

AMERICAN SCHOOL OF CORRESPONDENCE

3322-28 Armour Avenue, CHICAGO, ILL.

Mention Technical World Magazine

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

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JUST FROM THE PRESS

ELECTRICAL WIRING and

CONSTRUCTION

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TABLES

By HENRY C. HORSTMANN and VICTOR H. TOUSLEY

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

THIS BOOK CONTAINS:
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 calculation (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 necessary 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 everything that would make it unnecessarily cumbersome has been omitted. There is no padding. Every page is valuable and a time saver. This book can be used every day by the wire-man, the contractor, 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
Modern Electrical Constructions, price

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

OUR GUARANTEE

$1.50

$1.50

$4.00

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.

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A NEW MOST EXHAUSTIVE-AND COMPREHENSIVE TREATISE
NEW-MOST

ON

STEEL

ITS METALLURGY AND MECHANICAL TREATMENT
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 illustrations in the text, $9.00

Net

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 ::

J. B. LIPPINCOTT COMPANY, Publishers,

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PHILADELPHIA

Mention Technical World Magazine

HOME STUDY

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, CHICAGO, ILL.

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Music Lessons Free I WILL MAKE YOU

IN YOUR OWN HOME.

A wonderful offer to every lover of music, whether a beginner or an advanced player.

Ninety-six lessons (or a less number if you desire) for either Piano, Organ, Violin, Guitar, Banjo, Cornet or Mandolin will be given free to make our home study courses for these instruments known in your locality. You will get one lesson weekly, and your only expense during the time you take the lessons will be the cost of postage and the music you use, which is small. Write at once. It will mean much to you to get our free booklet. It will place you under no obligation whatever to us if you never write again. You and your friends should know of this work. Hundreds of our pupils write: "Wish I had known of your school before." "Have learned more in one term in my home with your weekly lessons than in three terms with private teachers, and at a great deal less expense." "Everything is so thorough and complete." "The lessons are marvels of simplicity, and my 11-year-old boy has not had the least trouble to learn. One minister writes: "As each succeeding lesson comes I am more and more fully persuaded I made no mistake in becoming your pupil."

We have been established seven years-have hundreds of pupils from eight years of age to seventy. Don't say you cannot learn music till you send for our free booklet and tuition offer. It will be sent by return mail free. Address U. S. SCHOOL OF MUSIC, Box 130A, 19 Union Square, New York City.

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No matter where you are located or what your former occupation. If you are honest and ambitious, write me at once. I will teach you the Real Estate, General Brokerage and Insurance Business thoroughly by mail and appoint you

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EDWIN R. MARDEN,
President National Co-Opera-
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615 Athenaeum Bldg., Chicago
615 Maryland Bldg., Washington, D. C.

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