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Entered at the Postoffice, Chicago, Ill., as second-class mail matter


$1500 A Year


For Life

IF YOU WISH TO save for old age or provide for healthy middle age, you can not find a more conservative or a more reasonable investment than we have to offer-more profitable than life insurance-safe as city real estate, yet not so costly-better than a savings bank, for the return is greater.

We have full and complete literature, showing conclusive facts, logical figures and definite reference of good character, proving beyond any doubt that our proposition is 15 Month-Old TREES bona fide, certain and profitable. Our booklets give "reasons,' and those who can spare from $5 to $25 a month can provide for old age and protect themselves against the ravages of time, the chances of poverty and the misfortune of ill-health by securing a competent income that will cover all necessary living requirements.

It is worth your time to ask for our booklets -do this to-day in justice to your future. It is not only the man who saves, but he who saves profitably. The demand for rubber can never be fully supplied-a rubber plantation is more hopeful than a gold mine- - our booklets tell you the facts that have taken years to prove-write for them to-day.

This company is divided into only 6 000 shares, each one representing an undivided interest equivalent to an acre in our Rubber Orchard and Plantation Our booklets will prove to you that five shares in this investment, paid for at the rate of $25 a month, will bring you an average return of 25 per cent. on your money during the period of seven years and an annual income of $1,500 for life. This investment insures absolutely the safety of your future. The man or woman who owns five shares in our rubber plantation in tropical Mexico need have no fear of old age, no doubts about illness, no care nor anxiety for after years-you are safe--absolutely and certainly our booklets will prove these statements -write for them to-day.

Conservative Rubber Production Co.

609-611 Monadnock Building,"






told by The American Blacksmith-a magazine just brimful of good, solid, practical, money-bringing information by such authorities as Markham, Richardson, Bacon Shaw, Woodside, Harnwell, Perrin, Googerty- the pick of the smithing world. Let The American Blacksmith Lolve your problems in tool dressing machine-smithing, ornamental work, painting, repair work, horseshoeing, vehicle work. Let it do for you what it did for Mr. Willis Spense of Chester, South Carolina: "I was receiving $1.75 per day of 10 hours and am now offered $5 per day of 8 hours. This I consider was accomplished by reading The American Blacksmith and paying strict attention to the instructions."

Monthly-One Dollar a Year. American Blacksmith Company

1339 Prudential Bldg., 8883

Buffalo, N. Y.


This Book

contains more matter on the subject of pipe, fittings and valves than anything ever printed. Prepared for Engineers, Draftsmen and Architects.

If you are interested in engineering subjects and drafting, send 25 cents for four months' trial subscrip

tion to Browning's Industrial Magazine, formerly "The Draftsman." New data sheets each month.

Browning's Industrial Magazine for one year and the book "Pipe, Fittings and Valves," sent for $1.10.

Second Edition of a booklet on Lettering sent postpaid for 25c.

The Browning Press
Collinwood, Ohio

Mention Technical World Magazine

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ROM Jersey City to Broadway in three minutes brings New York an hour nearer Chicago. From Wall Street to the clear air and open country of Long Island in fifteen minutes is a vastly important thing to congested Manhattan. These are but two of the great responsibilities that rest on the shoulders of Charles M. Jacobs, the English bridge builder and tunnel digger, who is directing the Pennsylvania bore from Long Island, across Manhattan and under the Hudson River. Incidentally Mr. Jacobs has charge of the tunnel from Jersey City to Dey street and Broadway, as well as the tunnel across East River from the Battery to Brooklyn, and the completed New York and

Jersey tunnel to Twenty-third street"plans," said the State Railroad Commission in 1902, at the time of their inception, "that surpass in magnitude any in the world." Last in the category of Mr. Jacobs' achievements, but first in order of completion, was the gas tunnel from Ravenswood, Long Island City, to East Seventy-first street, Manhattan. This bore was nearly a half mile long under the swift current of Hell Gate. It was Mr. Jacobs' first triumph-a work abandoned by the original contractors.

A man who has accomplished such stupendous tasks owes a duty to the public. He should at some time or other tell us of his work, but "Silent Jacobs," as he has come to be known, has only given personal expression of his achievements to the public on two occasions. The first to the effect, "That he was the first engineer

Copyright, 1907. by Technical World Company.


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