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Something New

A Book giving Dimensions of

PIPE. FITTINGS and VALVES

Over fifty tables and many illustra-
tions of all kinds of articles that the
draftsmen or architects may need in
laying out pipe work on drawings.

Flexible Backs. Good Paper.
POSTPAID 50 CENTS.

Address

THE DRAFTSMAN

CLEVELAND, OHIO

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Municipal Engineering (August) Indianapolis and New York

THE FIRST ARTICLE is on "Concrete-Steel Bridges at Dayton, Ohio." The concrete construction is becoming such an important factor in the building trades at the present time, that these articles are always read with great interest.

Another interesting article is on "Paving Materials," by John W. Alvord, C. E. In this article the writer gives an excellent description of the most common kinds of pavement, such as asphalt, stone pavement, brick, wood, macadam, and bitulithic.

The usual interesting departmentsQuestion Department, Notes on Water Supply, Cement and Concrete, Streets and Lighting, Sewerage, etc. are excellent.

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Amateur Work (August)-Boston, Mass.
THE LEADING ARTICLES for this month's
number of Amateur Work are along elec-
trical lines, the first being "The Tele-
graph Transmitter," by Frederick A.
Draper, which takes up a simple arrange-
ment for transmitting messages.

The second article, on "Wireless Telegraph Apparatus," by Howard W. Rice, gives a few personal observations upon the interesting devices employed in space telegraphy.

"Telephone Circuits and Wiring," by Arthur H. Bell, is the third article along this line. A very interesting item is that Mention The Technical IV'orld.

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Our Grandfathers

Would Have Enjoyed Reading

the New Science Library-but they would have considered it an extraordinary work of fiction, with its story of electric currents flashing messages through space half around the world; of a metal so rare that it costs half a million dollars an ounce; of astronomers determining the exact constituents of a star a trillion miles away; of a theory of evolution which carries the origin of man back millions of years to a lower form of life. They would have found a surprise on every page-yet the New Science Library is filled with sober facts, which the amazing progress of the last fifty years has brought to light. Until you read this magnificent record of man's achievements you cannot realize fully how science has transformed the entire fabric of intellectual and commercial life. It describes simply, clearly and accurately the great inventions and discoveries of the nineteenth century. It will tell you what the famous Darwinian theory is; how the sun and planets are weighed and their motions charted; how liquid air is made and used; what radium is; what ideas Herbert Spencer brought into the world-and a thousand other interesting things you have always wanted to know. It teems with ideas and suggestions, as well as with facts. It will lift the reader out of the dull circle of commonplace things.

The New Science Library

is the autobiography of the nineteenth century-written by the men who made modern science. It consists of sixteen volumes covering comprehensively the whole field of Evolution, Astronomy, Invention, Geology, Electricity, Political Economy, and Anthropology. This Library is a necessary set of books-necessary to the reader who expects to be well informed. Among its authors are Spencer, Darwin, Proctor, Lubbock, Huxley, Tyndall, and other leaders of modern thought. It is a work to be read and enjoyed, for the great authors who wrote it were too close to nature to be dull and too big and human to be narrow.

We Want to Tell You More About This

If you are interested enough in the plan and scope of this well-rounded Library of Science to spend a two-cent stamp to send to us the coupon cut from this advertisement we will forward you by return mail a handsome descriptive booklet, with specimen pages, sample portraits, and illustrations. At the same time we will send you full particulars of our Introductory Offer, which cuts the regular price squarely in two, and our Individual Payment Plan, by means of which the purchaser arranges the payments to suit himself. At the Introductory price this Library is an extraordinary book bargain, within reach of every reader of THE TECHNICAL WORLD.

Better Do It Now!

Public Opinion has exclusive control of the first edition, which will be distributed at half-price, in combination with a year's subscription to the magazine. By this plan we are able to offer you the greatest book bargain of the year-including a set of the first edition of an invaluable work, and 52 numbers of Public Opinion (regular subscription price $1.00 a year). To secure a set at the introductory prices mail us the coupon at once, before the first edition is exhausted.

PUBLIC OPINION

44-60 East 23d Street, NEW YORK

Mention The Technical World.

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Jeffrey Manufacturing Company, Columbus, Ohio, U. S. A. Bulletin No. 8. Pages 16. Paper, 8 by 10 inches.

THIS BULLETIN describes the general features and advantages of the Jeffrey Gathering Locomotives. The several illustrations show some of the types of Gathering Locomotives. They are made in different sizes, and are equipped with either one or two motors, dependent upon the weight of the locomotive. The distinctive feature of the electric gathering locomotive is that it may be operated over tracks where there is neither trolley wire nor steel rails. This is made possible by carrying upon the locomotive a reel of flexible, insulated conductor, which is operated by a friction-clutch positively driven by a silent running chain and sprocket from the motor, the control of the clutch being placed within easy reach of the motorman at the operating end of the locomotive.

The use of Jeffrey Gathering Locomotives has many advantages. It reduces the wear and tear of the road-bed; the gathering of coal is performed with regularity, causing little or no confusion; and the air in the mine, on account of absence of mules and horses, can be kept pure.

Hetterschied Manufacturing Works, Grand Rapids, Mich. Pages 4. Paper, 5 1-2 by 9 inches. THIS PAMPHLET gives illustrations and descriptions of three of this company's latest improved drawing tables, which are adapted for use in Drawing Schools, Public Schools, Manual Training Schools, Engineering Schools, etc. The tables are made entirely of metal, aside

Mention The Technical World.

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