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Are You a Young Man ?

Largest field, biggest rewards are open in the various branches of engi-
neering. Find out what you like and what you are best fitted for.

Are You a Business Man?

New opportunities, new inventions, new mechanical methods make the
difference between success and failure. They are all described.

Are You a Manufacturer?

Here's a way to cut your coal bills in half. Each of a dozen articles
number may save you money.

in every

Are You a Farmer?

Your most enterprising rivals are using special automobiles to do most
of the work about the farm. One of a hundred chances for you to
save time and money.

Are You a Railroad Man?

A new motive power promises to take the place of steam. Scores of
new devices for improving rolling stock are on the market. You can't
afford not to be posted.

Are You a Housewife?

Cook, iron, heat, wash dishes, run the sewing machine by electricity.
People who do tell how and what it costs.

Are You an Intelligent Person of either Sex?
You want to keep informed on what real men are doing in the world—
more startling and exciting than any novel - more entertaining than
fiction can possibly be―told in plain, simple, every-day words—magnifi-
cently illustrated with photographs from life. To read it is a liberal
education.

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Mention Technical World Magazine

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CATALOGUE CHEMICAL TECHNOLOGY AND GENERAL CHEMISTRY

PUBLISHED AUGUST 15, 1905

Our Complete Classified Catalogue of Books on Chemical Technology and General Chemistry arranged under the following heads: Acids, Alkalies, and Salts; Beverages, Brewing, Cider, Distillation, Fermentation, Liquors Preserving, Vinegar, Wine; Brick, Ceramics, Glass, Porcelain, Pottery: Cement and Concrete; India Rubber, Gutta Percha, Glue, Ink; Leather Manufacture; Oils, Fats, Waxes, Paints and Varnishes; Paper Manufacture, Fibres; Perfumery: Soap and Candles; Sugar, Starch; Flour, Baking, Bread, Confectionery: General Reference and Receipt Books. General Chemistry, Chemical Arithmetic, Calculation, Tables, etc.: Chemical Analysis; Inorganic Chemistry: Organic Chemistry; Electro-Chemistry; Addenda; sent free to anyone in any part of the world who will send his address. HENRY CAREY BAIRD & Co. Industrial Publishers, Booksellers and Importers, 810 Walnut St. :: Philadelphia, Pa.. V. S. A.

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On the shelf it looks just like a book; holds one number or a volume; as simple as tying a shoe. See it at News, Book or Stationery Dealers-ask them to get it-or write to TECHNICAL WORLD MAGAZINE, CHICAGO, ILL.

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THIRTY MILLION
DOLLARS

WORTH OF BUILDINGS IN THE
PAST TWO YEARS

Have Tested the Efficiency of the Kahn System of Re

inforced Concrete.

Back of this wonderful record stand the endorsements of exhaustive Official Tests made in this country and in Europe.

The "Bulletin" is published in the interests of the Kahn System of Reinforced Concrete. It is issued monthly and the complete Bulletin of which this is merely a suggestion will be sent you upon request.

The Kahn System has behind it a million dollar organization, a staff of more than seventy-five experienced college graduated engineers, an equipment to handle every detail of a building, no matter how large, with a maximum economy, maximum engineering skill and maximum speed.

Constructions of concrete, reinforced by the Kahn Trussed Bar are absolutely fireproof Their Strength increases with age. They are absolutely permanent. The steel reinforcement is thoroughly protected from rust by the. concrete, which is virtually masonry of ever increasing strength.

This form of construction lends

itself to all kinds of A Typical Factory Built Throughout according to the Kahn
buildings, including
skyscrapers, fac-

tories, warehouses, grain elevators,
tunnels, in fact any structure com-
posed of beams and columns.

We are prepared to furnish you
with preliminary designs and care-
fully prepared estimates of your

System of Reinforced Concrete.

building entirely free of charge. We

solicit contracts on a cost-plus-fixed

sum basis. We are always ready

to send to any portion of the coun-
try, a most complete construction
organization and elaborate equip-
ment for the erection of any struc-

ture no matter how large it may be.
We have built or have in process of
building plants for six of the largest
automobile factories in the world.
Send for list and a copy of "Tests."

Trussed Concrete
Steel Company

Offices in all Principal Cities

25 Congress Street
Detroit, Michigan, U. S. A.

Boilers, Engines and
Feed Water Heaters

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MANUFACTURED BY

THE

Brownell Company

BRANCH OFFICES

No 811 N. Second Street, St. Louis, Mo.

Main Office and Works
DAYTON, OHIO

: : No. 924 Monadnock Block, Chicago, Ill.

Mention Technical World Magazine

HIS

Thousand Dollar FURNACE

Ν

IN the good old summer time thoughts of saving money on winter coal bills ought to be as refreshing as zephyrs from pine woods. The UNDERFEED way is not only the rational way of burning coal, and this modern Peck-Williamson Furnace not only consumes smoke and gases, but it gets as much heat out of the cheapest coal as the same amount of highest grade anthracite will yield. Can you figure that out in dollars? The difference in cost is yours. The

Peck-Williamson
Underfeed Furnace

Saves 1-2 to 2-3 on Coal Bills

With the old-fashioned Over-feeds, much money is burned up, as considerable heat goes to waste up the chimney. The Underfeed plan saves at the coal bin. We have hundreds of voluntary testimonials, eloquent proofs of that furnace truth. Here's a late one-Dr. F. M. Garrett, of Liberty Center, Ind., writes:

"Your furnace is all right, a great fuel saver, and the one you placed in our residence last year gave us the very best of satisfaction. If we could not get another one I would not have this one removed for a thousand dollars."

In time of warmth prepare for cold. Our heating plans and services of our Engineering Department are yours-FREE.

Send for the Underfeed booklet, which gives full description of this wonderful furnace, and is filled with fac-simile testimonials from those who know its worth. Write to-day, giving name of local dealer with whom you prefer to deal.

THE PECK-WILLIAMSON CO.

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Practical Electricity

THE BOOK OF MERIT

Its arrangements; its questions and answers; its dictionary: makes the study of the subject a pleasure

There are XX chapters or subjects carrying you from the fundamental principles of electricity on through the various branches to a point where the careful student comprehends the complete designing, care and operation of a dynamo or a motor. Each subjectis carefully written and to the point. After a student studies a subject, he is questioned on that subject in such a manner as to bring clearly to his mind the points

he needs to know regarding same. A DICTIONARY in back of book will enable him to learn the meaning of any electrical word, term or phrase used in this book as well as hundreds of others in common use. All required tables necessary

in the study are in it.

Price $2,00

per copy

This book will help you in the study of electricity as no other book ever has.

The offer we make of refunding money if book is not satisfactory upon examination is AN UNUSUAL ONE in connection with the sale of a book. But we have no fear of its return. Your decision will be what thousands of others' have been. Money would not buy it ifit could not be duplicated. We could print testimonials by the hundreds. It is the best to order and be your own judge of its merits.

We are now selling the fourth edition. No other electrical book has ever had so great a circulation.

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