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Recent Engineering Books for Students

Abbott's Telephony, 6 volumes,

$6.00
Sold separately, $1.50 each.
Baum's Alternating Current Transformer,

1.50
Bell's Art of Illumination,

2.50
Considere's Reinforced Concrete,

2.00
De la Tour's Induction Motor, Its Theory and Design, 2.50
Gonzenbach's Engineering Preliminaries for an Interur-
ban Electric Railway,

1.00
Gotshall's Electric Railway Economics and Preliminary
Engineering,

2.00 Goodell's Water Works for Small Cities and Towns, 2.00 Lyndon's Storage Battery Engineering, 2nd edition, 3.00 Meyer's Steam Power Plants, Their Design and Construction,

2.00 Miller's American Telephone Practice,

3.00 Reed's American Meter Practice,

2.00 SEND FOR OUR NEW 96 PAGE BOOK CATALOGUE

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LITERATURE-(Continued)

Something New

A Book giving Dimensions of

PIPE, FITTINGS and VALVES

solutely essential is a scientific training to success in practically every sort of career.

The article on Amateur Engineering, by E. P. Watson, proves the expediency of placing an undertaking in the hands of a trained engineer rather than attempting to do the work oneself without the proper knowledge.

Other articles are:
Mineral Shipments at British Ports, by
Brysson Cunningham, B. S.

Insulator Pins for Transmission Lines, by
Alton D. Adams.

Specialized Machine Tools, by Joseph Horner.

Developing a Water Power, by Thorburn Reid.

Biographical Sketch of Edwin Wilbur Rice, Jr.

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Municipal Engineering (August) – Indianapolis

and New York TIIE 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 departments, Question 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 TeleDESIGNERS

graph Transmitter," by Frederick A. Draper, which takes up a simple arrangement 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. 166 S. CLINTON ST.

“Telephone Circuits and Wiring,” by CHICAGO-ILL.

Arthur H. Bell, is the third article along

this line. A very interesting item is that Mention The Technical Il'orld.

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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 Evolu on, 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 partic-
ulars 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.

Tech.W.
Better Do It Now !

Mail this
Coupon

Public
Public Opinion has exclusive control of the first edition, which will

Opinion be distributed at half-price, in combination with a year's subscription to

New York 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 invalu

below, without cost to

me, your handsome specable work, and 52 numbers of Public Opinion (regular subscription price

imen-page book of The New set at the introductory prices mail us the coupon at once, before the first edition is exhausted.

lars of your introductory offer

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Please send to address

$1.00 a year). To secure

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CIPLES
PRACTICE

LITERATURE-(Continued) entitled "A Handy Combination,” by R. G. Griswold. This tool is a combination of scroll or jig saw, a grinding and polishing attachment, and a drill.

Other articles are:

A Bench Grinder, by B. R. Wick (including Working Drawings).

Pattern-Making for Amateurs, No. VI, by F. W. Putnam.

Several articles on Photography.

Joints and Woodworking, by Frank Cecil
Bain.

Tool-Making for Amateurs.
Soldering, No. II, by H. M. Chadwick.

A NEW TELEPHONE BOOK

Complete and up-to-date, written by a practical man. All about modern telephone apparatus, their principles and use. I. Fundamental Ideas II. Telephone Apparatus III. Systems of Communication IV. Construction and Equipment

In 32 chapters, 450 pages, 375 illustrations.

Prico $2.00 postpaid

Send postal money order to The Technical World 3321 Armour Avenue, Chicago, Illinois

KEUFFEL & ESSER CO.

Catalogues
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.

OF NEW YORK

Drawing Materials

Hetterschied Manufacturing Works, Grand Rapids,

Mich. Pages 4. Paper, 5 1-2 by 9 inches.
Surveying Instruments

Tus PAMPHLET gives illustrations and
Liberal Discounts to Students

descriptions of three of this company's

latest improved drawing tables, which are 111 Madison Street,

Chicago, III.

adapted for use in Drawing Schools,

Public Schools, Manual Training Telephones : Main 4803; Automatic 6287

Schools, Engineering Schools, etc. The

tables are made entirely of metal, aside Mention The Technical World.

.

ESTABLISHED 1874

W. P. Dunn Company

Printers

Compilers and Makers of

Booklets and Catalogues Designs Suggested and Estimates Furnished

Correspondence Solicited

167 Adams Street

Chicago

Printers of this Magazine

Mention The Technical World.

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