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CYCLOPEDIA OF APPLIED

ELECTRICITY

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IVE Volumes-2,500 Pages-size of pages, 8x10 inches. Handsomely and durably bound in buckram, profusely illustrated with over 2,000 full-page plates, diagrams, plans, sections, tables, formulæ, etc. Invaluable alike to the expert electrician and the apprentice. Thousands of dollars and years of preparation have been required to compile the material for this work. Every section written by an acknowledged authority. Prepared especially for practical, everyday use. Combines the best features of a textbook and a reference work, as every volume is supplemented with a carefully prepared list of test questions to impress the important points upon the reader's mind. A ready reference work for the experienced workman, as it is free from abstract theory and difficult mathematics.

Half Price Special Advance Offer.

$2.50 PAID NOW secures this $25.00 Cyclopedia for just half price-$12.50-delivered, express prepaid. The regular price of the Cyclopedia of Applied Electricity is $25.00.

We are printing an edition for our own use. To secure immediately a sufficient number of orders to warrant our increasing the edition, and thus reduce the cost of manufacture to us, we will distribute 1,000 extra sets at the reduced cost of manufacture while they last. We do this to introduce the work, knowing that it will greatly increase the regular sale. This offer is made for immediate acceptance. Reservations must be made now.

The full set of five volumes will be delivered to you as soon as it is off the press. Cut out the coupon below and mail to us. No further payment need be made until November 1st, when payment of balance at the rate of $2.00 per month must begin. Order immediately to insure yourself this valuable reference work at half price.

ORDER NOW-Order will be entered as received, and positively no sets will be sold at half price after the edition now at press has been subscribed. If you are not in time for a set your $2.50 will be returned to you.

Some of the Writers.

PROF. F. B. CROCKER, head of Department of Elec-
trical Engineering, Columbia University: author of
the sections on Storage Batteries and Management
of Dynamo Electric Machinery.

PROF. WILLIAM ESTY, head of the Department of
Electrical Engineering, Lehigh University: author of
the section on Alternating Current Machinery.
H. C. CUSHING, Jr., Wiring Expert and Consulting
Engineer: author of the section on Wiring for Light
and Power.

PROF. DUGALD C. JACKSON, Collaborator with
PROF. GEORGE C. SHAAD, University of Wiscon-
sin: author of sections on Power Transmission,
Electric Lighting and Central Stations,

J. R. CRAVATH, Western Editor of the Street Railway
Journal: author of the section on Street Railways.
PROF. LOUIS DERR. Mass. Institute of Technology:
WILLIAM BOYRER, Telephone Expert and Consult-
ing Engineer: CHAS. THOM, Chief of Quadruplex
Department Western Union Telegraph Co.: author of
section on Telegraphy, and others.

-COUPON-Cut out and mail toAMERICAN SCHOOL OF CORRESPONDENCE at Armour Institute of Technology.

Enclosed find $2.50 for first payment on half-price sale of Cyclopedia of Applied Electricity. The balance ($10) I will pay in monthly payments of $2.00 each, beginning November 1.

It is understood that I may return the set at your expense within five days, and that you will refund the amount paid if the set is not wholly satisfactory to me. Also that you will return the $2.50 if my order is received too late for the half-price sale. (Tech. World.) Name........

St. Address..

Partial Table of Contents.

Part I.-Static and Dynamic Electricity-Primary Batteries-Ohm's Law-Wire Calculations- Electrical Measurements-Wiring for Light and Power-Electric Telegragh, including the Duplex and Quadruplex.

Part II.-Theory of Dynamo-Electric Machinery-Design and Construction of Dynamos and Motors-Types of Machines-Storage Batteries, including Theory, Management and Types.

Part III.-Incandescent and Arc Lighting-Electric Railways, including Car Wiring, Line Construction, ThirdRail and Multiple-Unit Systems-Management of Dynamo-Electric Machinery-Power Station Work, including Boilers, Engines and Electrical Machinery-High Tension Transmission.

Part IV.-Theory of Alternating Currents-Construction, Types and Operation of Alternators, Transformers, Induction Motors, Synchronous Motors and Rotary Con

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AMERICAN SCHOOL of CORRESPONDENCE

At ARMOUR INSTITUTE OF TECHNOLOGY, CHICAGO

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Even a gifted writer like Elbert Hubbard cannot adequately describe the value of this cabinet to the man with a desk. It forms a complete, durable, ever-ready receptacle for all the clippings, manuscripts, illustrations you wish to preserve the cleverest classifier of miscellaneous papers ever invented. It is a veritable savings bank of information-worth 47 scrap books.

All complete, it consists of a substantial air tight, dust-proof box fitted with a full supply of specially made holders, each of which not only shows the contents in it, but by the ingenious indexing system shows just where everything else referring to its contents may be found. It sits conveniently on your desk and takes care absolutely of all the papers and data that you might otherwise lose or forget-perhaps throw in the waste basket for want of a better place to put it. The cabinet is a genuine Library Filing Cabinet never before made in desk size, and has sold for $15.00 to $500.00 in large sizes. The Desk Cabinet we offer you free is equal in every respect to the expensive kind except the size. The free offer is in connection with

SYSTEM

Edited by A. W. SHAW

SYSTEM gives every month 200 or more pages of indispensable information for business men.

System is essential to business success. And, so is SYSTEM, the magazine. It tells every month all. the new business tricks that save time -all the little office wrinkles that save worry. Through SYSTEM you can learn all that anyone can possibly tell you about system and business methods. The regular reading of SYSTEM will solve your business perplexities-but if it does not, SYSTEM has a staff of experts-practical business men who will answer your questions gladly and cheerfully and promptly. This service will cost you not one single penny-if you are a subscriber to SYSTEM. The price of SYSTEM is two dollars a year. It is worth a great deal more than that to an alert man with his eyes on the main chance.

An official of the National Cash Register Company, says: "The ideas gathered from your magazine have enabled me to formulate systems for Mr. Patterson's letters,books, pamphlets, orders, etc., which have simplified the work greatly.' "I have learned more from SYSTEM in five months than in ten years of hard study and knocks in business. It is worth ten times the charges for it. F. A. PHILBRICK, Baraboo, Wisconsin.

Special Offer

We said the desk cabinet would cost you nothing. Here is the way. Send us two dollars for a year's subscription to SYSTEM and we will send you, every cost prepaid, a cabinet with your name in gold on top. Write your name and address in the white space opposite; tear out this advertisement and mail it to us. Write plainly, so that we will make no mistake in setting your name. Inclose the money and we will enter you as a subscriber-send you an expert consultation certificate enti tling you to free advice -and ship you the cabinet. Act at once. We have only a few of the cabinets on hand and we believe they will be snapped up in a hurry. ACT.

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THE SYSTEM COMPANY 992 First National Bank Building.

Write Name and Address Here

Chicago

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CITIZEN'S BUILDING.

Designed and Constructed by Hubbell & Benes, Architects.

An Error Corrected

THROUGH a misrepresentation of facts, the Editors of THE TECHNICAL WORLD were led or rather misled-into making an erroneous statement in the August number regarding the designing and construction of the Citizens Building, Cleveland, O., ascribing the credit therefor to the wrong party. The architects of this structure were Messrs. Hubbell & Benes, who have their offices in the building; and THE TECHNICAL WORLD gladly takes this opportunity to correct the

error. Mention The Technical World.

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GRADUATE AND STUDENT NOTES-(Concluded)

On the Honor Roll

ON THE FOURTH OF JULY, Sey

mour J. Leighton, of Lawrence, Mass., a student of the American School, lost his life in an attempt to rescue two young girls who were out canoeing on the Merrimac river. The strong current carried the canoeing party over the dam to their death. Mr. Leighton, who had the reputation of being a powerful swimmer, sprang to the rescue. He had almost reached the upturned canoe, when his head struck one of the many rocks, and in a moment he had sunk from view, dead but a hero.

Mr. Leighton was an earnest student. The thoroughness of his work had won for him the esteem and respect of his instructors.

Poor Richard's Lament

BENJAMIN FRANKLIN had just drawn down the lightning from the clouds on his kite string.

"Great Kilowatts!" he muttered, scratching his head with tingling fingers, "What have I done? Already I foresee that ages yet unborn will refer to this afternoon's performance as a shocking experience!"

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A NICKEL in the hand is worth two in the slot.-Philadelphia Record.

WANTED-By an academy for young ladies of an impressionable age, a thoroughly insulated young electric engineer.

WHEN the Jap navy heaves in sight, the Russians experience that sinking feeling.-Life.

SOME MEN figure their profits on paper, but the average coal dealer figures his on slate.-Yonkers Statesman.

Mention The Technical World.

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Cut out the corner coupon and send it with one dollar to the

PRACTICAL PUBLISHING CO., 53 Broadway, New York

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HEATING-VENTILATING-PLUMBING

Original Articles Every Month by Experts

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