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PATENTS

GUARANTEED.

PATENTS SECURED OR FEE RETURNED. Send model or sketch for free report as to Patentability. Send for finest publications ever issued for free distribution "HOW TO OBTAIN A PATENT." with 100 MECHANICAL MOVEMENTS illustrated and described, and "WHAT TO INVENT," containing valuable LIST OF INVENTIONS WANTED.

ONE MILLION DOLLARS offered for one invention, $16,000 for other.
WORLD'S PROGRESS." Copy free.

Patents advertised free in

EVANS, WILKENS & CO., 615 F Street, WASHINGTON, D. C.

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ATENTS

Valuable Book on Patents FREE, Tells how to secure them at low cost. How to Sell a Patent, and What to Invent for Profit. Gives Mechanical Movements invaluable to Inventors Full of Money-Making Patent

Information. NEW BOOK FREE to all who write. O'MEARA & BROCK, PATENT ATTORNEYS D18 F. Street, N. W., Washington, D. C.

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Mention Technical World Magazine

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THISTRY 20LER PUTES

PART I

ERICAN SPONDENCE

NEW 1907 EDITION

The only complete, up-to-date Library on Engineering published. Gives only the latest and most reliable information. Each volume contains a series of test questions. Written in a plain, simple, understandable manner.

Cyclopedia of Engineering

Five volumes, 2,500 pages, fully indexed, size of page 7 x 10 inches, bound in three quarters red morocco leather. Over 2,000 full-page plates, diagrams, sections, tables, formulæ, etc. Written by the foremost authorities and especially prepared for Home Study, after a careful study of shop needs and conditions. Years of experience in shop, laboratory and class room required in its preparation. Each section tested by actual use for its practical value to the man who desires to know the latest and best practice in shop and engine room. Numerous explanatory examples. Complete sets of test questions and reviews in every volume, thus combining the best features of a text book and a reference work. It is easily understood by the man who has little time to acquire the fundamental principles of Engineering.

NOW $19.80-REGULAR PRICE $30

Just the set of books for the Engineer, Boiler-maker, Machinist, Tool-maker, Pattern-maker, Sheet Metal Worker, Gas Engineer, and persons coming in contact directly or indirectly with machinery. The Cyclopedia is compiled largely from our instruction books, which have been tested by thousands of practical men. Each volume contains a series of test questions to emphasize vital points. Prepared especially for home study in a plain, understandable manner. This liberal offer is made for 30 days only to acquaint the readers of the TECHNICAL WORLD with the practical character of our correspondence instruction. Look them over for five days. If satisfactory, send us 82.00 down and $2.00 per month thereafter until the special price of $19.80 is paid; otherwise, notify us and we will transfer the books absolutely free.

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PARTIAL LIST OF CONTENTS
Principles of Heat- Chemistry-Boilers-Calorimeters-
Steam Pumps-Elevators. Steam Engines-Steam Engine Indi-
cators-Valve Gears-Thermo-dynamics-The Steam Turbine-
Refrigeration-Ammonia Compression System and Absorption
System-Gas and Oil Engines. Marine Boilers-Marine Engines
-Condensers-Navigation-Locomotive Boilers and Engines-
Valve Motions Types of Locomotives-Air Brakes-Automobiles.
Machine Shop Work-The Lathe The Planer-The Shaper-Ven-
tilation Heating - Mechanical Drawing - Air Compressors.
Theory of Dynamo-Electric Machinery-Direct Current Motors
Electric Wiring-Electric Bell Wiring-Electric Lighting-
Storage Batteries.

Please Mention Technical World Magazine, Feb. '07

Mention Technical World Magazine

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IT

T requires the highest grade of workmen, highest grade of machinery, highest grade of colors to procure the best results in printing. We Have Them. C. While at first thought it may seem expensive to you to have your work done under these conditions, yet it is the cheapest printing you can buy, for it attracts comment and is not thrown away, although the reader has no immediate use for the article advertised. C. That class of advertising is laid away for future use or reference. ::

W. P. DUNN COMPANY 167 Adams Street, Chicago

Producers of

BUSINESS-GETTING PRINTING

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"TALK ON CLASSIFIED"

If you had a sales organization of 866 men continually calling on people interested in your proposition-

If each man made 30 calls a day and no territories overlapped-no calls were duplicated

Don't you think some sales would be made?

Suppose these 866 men kept on working for a month-making over 30 calls every day about 25,000 calls in a day-650,000 calls in a single month-bringing in their reports, their orders, their collections promptly--taking absolutely none of your time for detail and then at the end of the month you merely had to pay the street-car fare for these 866 men-no salary, no commissions, absolutely no other expenses except street car fare

Don't you think you would make a profit ?

The opportunity columns of the TECHNICAL WORLD MAGAZINE offer you even a better and cheaper way to reach 650,000 eager, interested buyers each month.

You cannot get a selling force of 866 men or any number of men or even one man to work for you merely for carfare. Even if you could get such a force to work for a mere nominal salary, you could not make it pay, because the men who would accept your offer could not get results.

The TECHNICAL WORLD MAGAZINE goes right into the home and stays there. It is a magazine for all the family. It is read by the ambitious school boy or girl, the ambitious young man anxious to rise in his profession, and the intelligent up-to-date thinking people of every community. On account of the nature of its contents it is preserved in the home for months for reference, and therefore advertising in it has exceptionally long life.

Your advertising in the Opportunity Columns would cost only $3.40 for one time for four lines. Even if you interest only one man in 10,000 you would make 65 sales, and surely 65 sales should net you a profit above $3.40, the cost of the advertisement.

If you have anything to buy, sell or exchange draw up an advertisement now, figuring eight words to the line, the cost of which is 85c a line, and fill out the order blank at the bottom of the page and send it with the money so it will reach us in time for our March issue.

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