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Don't Throw Away

Your Worn Tires

For over three years European motorists have been getting from 10,000 to 15,000 miles out of their tires by "half-soling" them with Steel Studded Treads. In eight months 20,000 American motorists have followed their example and are saving $50. to 200. a year in tire expense.

We ship on approval without a cent de

posit, prepay the
express and allow you to be the judge.
Durable Treads double the life of your tires
and are sold under a signed guarantee for 5000
miles without puncture. Applied in your own
garage in thirty minutes.
offered to motorists in new

Special Discount territory on first shipment

direct from factory. A postal will get full in-
formation and sample within a week. State size
of tires. Don't wait-write today. Address
nearest factory office.

THE COLORADO TIRE & LEATHER CO.
295 Goetz Bldg., W. Austin Ave., Chicago, Ill. 55 Tread Bldg., Denver, Colo.

Brass Band Instruments,
Drums, Uniforms, Supplies

Write for our big catalog. FREE.
Would you like to organize a band?
Write for full information and tell
us what instrument you are inter-
ested in.
LYON & HEALY
33-40 Adams St.

Chicago

OUR BIGGEST

LATHE VALUE

WHEN SHOULD YOU MARRY?
(Continued from page 386)

couples than by any class of couples
marrying at more mature ages.

The reason is plain. Where people
marry at very early ages there is less
compatibility, because there is less al-
lowance for tastes and dispositions.
Then, too, the young married pair, with
their crude ideas of the art of living
together, find each other out and come
to see that they are unsuitable compan-
ions.

They have married before their characters are settled, and while it may be argued that the couple can thus develop together, experience proves that this is often merely pretty theory, since in many cases, each mind follows a course incompatible with the other.

Dr. Russell Burton-Opitz of the Physiological Department of Columbia University, thinks that twenty-five is the lowest age limit at which a man should marry; but he places the woman's marriage age at a somewhat lower figure than some physiologists, considering SEARS, ROEBUCK AND CO. twenty years not too young.

16-inch Lathe with 6-foot bed, $252.00; other sizes at proportionately low prices. Every lathe guaranteed. Buy your lathe from us and save $50.00 or more. Machinery Catalog No. 76T139 sent free on request.

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Statement-Technical World Magazine

Published monthly at Chicago, Illinois

Managing Editor, William T. Walsh, Drexel Avenue and
58th Street
Chicago, Ill.
Publisher, R. T. Miller, Jr., Drexel Avenue and 58th Street
Chicago, Ill.
Owner, R. T. Miller, Jr., Drexel Avenue and 58th Street
Chicago, Ill.
None.

Known bondholders, mortgagees, etc.
Sworn to and subscribed before me this 17th day of March, 1915.
[SEAL]
G. A. KATES, Notary Public.
(My commission expires February 16, 1919.)

So, young man, if you would give your child a fair chance to live long in the land, do not rush into matrimony and parentage in your early twenties. Wait a few years and let that child have the benefit of your augmented transmissible resistance to disease, your increased mental power, and your greater bodily strength. And to the supporters of the Galtonian idea of early wedlock, who feel that to defer marriage and parenthood is to encourage immorality and greatly increase the number of permanent bachelors and spinsters, let it be said that this may still be true, but there is no reason why it should remain true; and as in each of these conditions there would naturally be born into the world a far less number of degenerates or those of mediocre. capabilities, later marriages are the better for all concerned. If we are ever to develop a race of supermen, it will be largely by reason of the postponement of marriage beyond the present average marital age of young people.

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Prof.

Henry

Dickson,

Principal

The Key to Success

Stop Forgetting

Increase Your Efficiency

The secret of business and social success is the ability to remember. I can make your mind an infallible classified index from which you can instantly select thoughts, facts, figures, names, faces. Enables you to concentrate, develop self-control, overcome bashfulness, think on your feet, address an audience. Easy. Simple. The result of 20 years experience in developing memories of thousands of students. Write today for copy of my book "How to Remember" and Copyrighted Memory Test Free, also how to obtain FREE copy of my book "How to Speak in Public."

Dickson School of Memory, 706 Auditorium Bldg., Chicago, Ill.

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trained over 2000 young men

in the past 22 years in the fundamentals of Applied Electricity, The Bliss Electrical School, with its well-equipped shops and laboratories, is peculiarly well qualified to give a condensed course in Electrical

ENGINEERING

including Mathematics, Steam and Gas Engines, Mechanical Drawing, Shop Work, and Theoretical and Practical Electricity, in all branches. Students construct dynamos, install wiring and test efficiency of electrical machinery. Course, with diploma, complete

IN ONE YEAR

for practical young men with limited time. 23rd year opens Sept. 22nd. Catalogue on request. 107 Takoma Ave., Washington, D. C. DO YOU LIKE TO DRAW?

SELL YOUR SERVICES to the Highest Bidder

We need high class solicitors and salesmen to represent a high class magazine.

GOOD PAY-AGREEABLE WORK

Write to-day for full particulars

Technical World Magazine, Chicago

巡禮

Your Hands Can't Earn the Money You Need

You'll have to work for low wages
all your life if you depend upon your
hands to make your living.

To earn more money you must have the
special training that will enable you to get
and hold a better job.

The International Correspondence Schools
will give you this necessary training in your
own home, in your spare time. They will
fit you for a better position, where you can

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earn more money.

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COPYRIGHT-INTERNAT. NEWS

LAUNCHING AMERICA'S LATEST DREADNAUGHT Miss Elizabeth Kolb christening the Pennsylvania. The main battery of the Pennsylvania will consist of twelve 14-inch 45-caliber rifles, set on four turrets, three guns to a turret. Her tonnage measurement is 31,400, against 27,500 for the Queen Elizabeth. The latter, however, carries eight 15-inch rifles, 45-caliber, set two to a turret. The British ships of the Queen Elizabeth class greatly exceed those of our navy in speed, since they make twenty five knots an hour.

The French battleship Bouvet was one of the first lost in the attempt to force

the Turkish straits.

WANTED IDEAS

Manufacturers are

constantly writing me for new ideas

PROTECTED BY OWEN PATENTS

FREE!

Send for the three finest patent books published and read their letters-see what they want! "SUCCESSFUL PATENTS"-tells how to proceed; "STEPPING STONES"-contains list of over 200 inventions wanted, the truth about prizes, etc.; "PATENT PROMOTION"-tells how to promote and sell your rights, chief causes of failure, etc. A simple request will bring you all three books absolutely free.

I help my clients sell their patents or dispose of their_applications.
Advice Free. No obligation incurred by writing me. Manufacturing
facilities. I get you strong protection or receive no compensation.

VERY HIGHEST REFERENCES

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SPECIAL!

Send me a sketch or model of your invention and I will make a search of the U. S. Patent Office Records FREE OF CHARGE and report to you concerning patentability, practicability, etc.

And an immense number of others whose letters are printed in my booklets.

RICHARD B. OWEN, 19 OWEN BUILDING, WASHINGTON, D. C.

Inventors submitting their invention to me are protected in a tangible manner until their applications are filed.

PATENTS TRADEMARKS

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30 YEARS

COPYRIGHTS

IN U.S.

PATENTS
EXPERIENCE PATENT OFFICE

Do not waste your money for patents procured by in-
competent solicitors. Such patents are worthless and
manufacturers will not buy them nor do they give ab-
solute protection. Consult an expert who is known
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safe. Head of the United States Patent Office and
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Taft and Wilson and Assistant Commissioner under
President McKinley. Thirty years experience in the
U. S. Patent Office qualifies me to give you expert
service and to secure you fullest protection. Inquir-
ies solicited.

Sole Offices, 152 Barrister Building, Washington, D. C.

EDWARD BRUCE MOORE

PATENT COMMISSIONER UNDER THREE PRESIDENTS

Wanted-New Ideas.

Write for List of Inventions Wanted by Manufacturers and Promoters and Prizes Offered for Inventions Amounting to $1,000,000; also list of Patent Buyers. All of these with

OUR FOUR BOOKS MAILED FREE UPON REQUEST. The best ever issued for free distribution

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In more ways than one, this striking photograph, taken during the heat of a battle in France, depicts something most different from the ordinary run of events. In most cases, the wounded must lie where they are until the engagement is ended by the victory of one side or the other, unless they can be reached by Red Cross workers; but here, two privates administered first aid, and, risking their lives in the attempt, carried their officer to the rear. The officer received rather an unusual wound, since, in fighting to defend a trench, men are hit only in the head, chest, or arms, by infantry bullets, and any other injuries are the result of a successful shot with a shell or shrapnel, that the enemy risks firing over his own attacking forces.

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