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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.

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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.

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.

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.

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

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LITERATURE-(Continued)

from the top. They are firm, rigid, and durable.

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New Era Gas Engine Company, Dayton, Ohio. Pages 40. Paper, 9 by 7 inches.

CATALOGUE with fine half-tone plates illustrating the New Era Gas Engine. This type of engine can be operated, using for fuel either natural or artificial gas, producer gas, acme gas, gasoline, kerosene, or distillate, and can be changed from one fuel to another without stopping the engine. The engines are of pleasing design, made heavy, strong, and simple. They are especially adapted for electric lighting and wherever a uniform speed is required.

American Injector Company, Detroit, Mich. Pages 72. Paper, 3 1-2 by 6 inches.

CATALOGUE, with illustrations, descriptions, and price lists of Ejectors, Jet Pumps, Drive-Well Jet Pumps, Exhaust Injectors, Fire Plugs, Grease Cups, and Brass Oil Cups. The American Injector Company are the sole owners and manufacturers of the U. S. Automatic and World (Double-Tube) Injectors. In this catalogue are some valuable tables; also practical questions usually asked of Engineers when applying for a license.

Mention The Technical World.

International Studio Summer Supplement

Uniform with " COROT AND MILLET," "Masters of English
Landscape Painting," "The Genius of J. M. W. TURNER, R.A.", etc.

THE ROYAL ACADEMY

FROM

REYNOLDS TO MILLAIS

THE RECORD OF A CENTURY

IN spite of the large amount of interesting and beautiful material available for the purpose, no serious attempt has hitherto been made to compile an adequate illustrated record of the Royal Academy.

THE SPECIAL SUMMER NUMBER OF "THE INTERNATIONAL STUDIO" will be devoted to the consideration of the work of Academicians and Associates from the year 1768 down to 1868. It will be divided into four main chapters, dealing respectively with the Painters, the Sculptors, the Engravers, and the Architects, with the addition of an introductory historical survey of the Academy as an Institution.

THE very large number of illustrations, consisting of PHOTOGRavures, Colour PLATES, and other reproductions, will include, among others, characteristic examples of the work of the following artists:

PAINTERS: Sir Joshua Reynolds, Francis Cotes, Benjamin West, Angelica Kauffman, Gains-
borough, Sir T. Lawrence, J. M. W. Turner, Sir David Wilkie, Sir H. Raeburn, John Constable,
Sir C. L. Eastlake, George Dance, Sir Edwin Landseer, Sir J. E. Millais, etc.
SCULPTORS AND ENGRAVERS: Joseph Nollekens, John Flaxman, F. Bartolozzi, Valentine
Green, William Ward, Samuel Cousins, Joseph Wilton, etc.

A NUMBER of portraits of artists, and facsimile reproductions of autograph letters, will form an additional interesting feature of the publication.

THE great expense involved in the production of the Special Summer Number renders it impossible to reprint, and orders should therefore be sent in without delay.

"THE GENIUS OF J. M. W. TURNER" was entirely sold out on the day of publication, and many intending subscribers were unable to obtain copies, or were compelled to pay three or four times original cost of the book through their failure to order beforehand.

ORDER BLANK

Please send me

copies of "THE ROYAL ACADEMY FROM

REYNOLDS TO MILLAIS" price Two Dollars each, for which I enclose.

Το

Name
Address

The above blank, when filled in, should be forwarded immediately to your bookseller or to the offices of
THE INTERNATIONAL STUDIO, 67 FIFTH AVENUE, NEW YORK.

Tech. World

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