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INTERESTED IN MECHANICS?

Our monthly journal, MODERN MACHINERY, keeps you informed on progress in the mechanical field. Nicely illustrated, interestingly written. Valuable alike to shop man or plant owner. We give here the table of contents of the July, 1904, number. HACHINERY EXHIBIT AT ST. LOUIS.-A RATIONAL BASIS FOR WAGES.-CHAS.C. CHRISTENSEN, M.E.-THE HERSTAL NATIONAL ARMORY.-MOLDING MACHINES. THE ULTIMETER.-A. TRAVELING MACHINE SHOP. -FORMING TWIST DRILLS.-PHOTO TAKEN BY RADIUM.-GERMAN HIGH-SPEED LOCOMOTIVE.- IRON AND STEE PROSPECTS IN FRANCE.-MACHINE FOR SPLITTING WOOD.-NEW FLOATING DOCK IN GERMANY.COST OF STEAM VS. HORSE POWER.-REFRIGERATING MACH'Y IN BATTLESHIPS.-POWERFUL TOYS OF WEALTHY AMERICANS.-WASTED MACHINERY ON PANAMA CANAL.-ELECTRIC POWER ERA IN SCOTLAND. -PNEUMATIC MAIL TUBE TESTS IN CHICAGO.-THE PAY CHECK SYSTEM.-STORY TOLD AT WORLD'S PAIR.-NEW MACHINERY OF THE MONTH.-HINTS IN MECHANICAL ENGINEERING.-QUESTIONS AND ANSWERS.

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With every sub

scription we send free any one of the three Premiums mentioned below. Subscribe now, $1.00 per year. No back numbers furnished The Handiest Thing in the World is

If You Have Not Got a "Desk

Watch" You Ought To Get One They will keep just as good time as an expensive watch: can be placed anywhere on your desk, or may be carried in your pocket. Once you find how convenient a desk watch is you will wonder how you ever got along without one. The watch is regular pocket size, full nickeled case, keeps accurate time and runs thirty hours with one winding.

Did You Ever Feel the Need of a Stylo?

GRAVITYSO STYLO !

NDING

A Stylo is a Pencil that writes with Ink-It is not a Pen. There is not a inan in the world who uses a lead pencil but has wished that it were possible to have a satisfactory pencil that used ink instead of lead. Well, here it is It is not

MERS the oldfashioned stylo with a stiff needle or spring needle: it has just been patented and placed on the market. It is called the Gravity Stylo, and its name signifies the principle on which it works. It is only another instance of going back to Nature's laws to

find success. One great advantage about these Stylos is that when left lying on the
desk they are at their best; even if left there for several days without any cap on they
will not leak and will be ready to write the instant the point touches the paper. For
ruling purposes they are unequaled. Ruling done with a Stylo is as even and per-
fect as that done by machinery. If you have a Stylo you have a pencil that is
always ready (just like a lead pencil), the advantage being that ink is used.

How Far Do You Walk

in a Day?

Did it ever occur to you that perhaps you walked miles
just going around your shop or office? Perhaps

Modern you'd like to know. If so, get a Pedometer. A

Machinery, Pedometer is an ingenious affair that goes when

Security Bldg. you go and stops when you stop. You put

Chicago it in your pocket like a watch (it's smaller

GENTI EMEX:than a watch, too), and when you want to

Enclosed find know how far you have walked, all you

81.00 for which please have to do is to look at the Pedometer.

send Modern MachinThese instruments have hereto

ery for one year, and fore been very expensive, costing

in accordance with your

offer, please send me. free from ten to fifteen dollars,

of charge, One Desk Watch. but this one has just been

One Stylo. One Pedometer. placed on the market. It is

(Kindly encercle one desired). not a toy, but an accurate

Yours truly,
and valuable recorder
of distance which any
man will find it worth
while to have.

CUT OUT AND MAIL TO-DAY

Mention The Technical World.

THE
SCIENTIFIC
LIBRARY

= 32 Volumes
FOR 50 CENTS

GRADUATE AND STUDENT NOTES-(Continued)

Hendrick, F. C., Chicago, Ill.—Course: Electrical.

Huck, John, Independence, La.—Course: Complete Mathematical.

Jessop, Edward, York, Pa.—Course: Mechanical.

Hetzler, G. E., Dayton, 0.—Course: Electrical.

Kellar, John G., Albany, N. Y.-Course:
Mechanical-Electrical.

Kylberg, Sylvester C., Wyoming, Milburn
P. O., N. J.-Course: Mechanical-Electrical,

Langsdale, B. W., Kansas City, Mo.

Course: Mechanical Drawing. And $1.00 a Month for 15 Months Lindholm, John I., Bridgeport, Conn.or Cash with the Order, $12.50 Course: Mechanical-Electrical.

Montgomery, E. G., Topeka, Kan.—Course : Heating, Ventilating, and Plumbing.

Osborn, Rex Elmer, Toledo, 0.–Course : W E HAVE decided to add a thousand new Mechanical-Electrical. customers to our list in the next few weeks

Petritsch, Jos., Chicago, Ill.—Course: Shop no matter what the cost. The plan we

Practice. adopted in order to do this is in making some Powers, Wm., Montreal, Que.-Course: (never-before-thought-of) offers to TECHNICAL Electrical. World readers. We were exceedingly fortu

Richardson, F. M. M., Nashville, Tenn.nate in securing a few sets of “The Scientific

Course: Mechanical-Electrical. Library" in a "remainder lot sale" which we

Wallace, John have just received. They are bound in Buckram

D., Chicago, Ill.—Course :

Mechanical Engineering. and have been selling regularly at $48.00 per set.

Winehold, Wm., Wadena, Ind.--Course: Volumes:

Locomotive.

Zito, James, Ft. Casey, Wash.—Course :
Tyndall's Fragments of Science, 2 vols.
Mendelieff's Principles of Chemistry, 4 vols.

Electrical.
Sir John Herschel's Outlines of Astronomy, 2 vols.
Darwin's Descent of Man, 2 vols.
Geikie's Text Book of Geology, 4 vols.
Smith's Wealth of Nations, 3 vols.
Darwin's Journal of Researches, 1 vol.

Personal Notes
Darwin's Origin of Species, 1 vol.
Bacon's Novum Organum, 1 vol.

MR. MANGER, of Dawson City, Yukon
Bacon's Advancement of Learning, 1 vol.
Huxley's Science and Education, 1 vol.

Territory, writes that there is a regular Tyndall's Sound, 1 vol.

stampede to the new Tanana placer digKelvin & Tait's Elements of Natural Philo., 1 vol. Spencer's Data of Ethics, 1 vol.

gings, that many of his friends are leavSpencer's First Principles, 1 vol. Kant's Critique of Pure Reason, 1 vol.

ing for the newly discovered goldfields. Hegel's Philosophy and History, 1 vol. Tunzleman's Electricity in Modern Life, 1 vol. Atkin's Elementary Text Book of Botany. 1 vol. Proctor's Other Worlds tban Ours, 1 vol.

Gosse's The Microscope, 1 vol. cloth. At LESS than ONE-THIRD the regular Mr. R. W. COLLINS, of Monterey, Cal., price. Sent by Freight, not Prepaid writes: “I was at Salmos for a year, re

building a badly run down plant, but These books should be in every house. The supply is limited. By filling out the cou

May ist was transferred to the plant at pon attached and forwarding to us, we

this place, where I have been made Suwill send the books to you for in

perintendent of the Company's work here spection. If satisfactory, send

and Chief Electrician of the other plants us 50c within 5 days, and

The then $1 a month for 15

-the Salmos plant having been taken

Pilgrim months, or $12.50 cash.

over by the above Company. Write now to the

Press, Chicago Pilgrim Press 69 Send on approval as

advertised in September 175 Wabash Ave. 70

TECHNICAL WORLD, 3 v. set CHICAGO

Scientific Library. If satisfactory will pay 50c cash and $1 a month for

MR. C. W. DOUGLAS, of St. Louis, Mo., 15 months. If not will return set an American School student, is attending within five days.

the summer school of the Armour InstiName......

tute of Technology, and taking the Address...............

courses in Mechanics and Electricity. Mention The Technical IVorld.

COUPON

CYCLOPEDIA OF APPLIED ELECTRICITY AREAL STORES LA

A PRACTICAL GUIDE for MECHANICS, ELECTRICIANS,
ENGINEERING STUDENTS and ALL PERSONS INTER-
ESTED IN ELECTRICITY yo yo yo yo yo yo yo

VIVE 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 es

pecially 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.

Some of the Writers.

$ 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 22.00 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.

Partial Table of Contents. PROF. F. B. CROCKER, head of Department of Elec Part 1.-Static and Dynamic Electricity-Primary Batter

trical Engineering, Columbia University: author of ies-Ohm's Law-Wire Calculations - Electrical Measthe sections on Storage Batteries and Management urements-Wiring for Light and Power-Electric Teleof Dynamo Electric Machinery.

gragh, including the Duplex and Quadruplex. PROF. WILLIAM ESTY, head of the Department of Part II.-Theory of Dynamo-Electric Machinery-Design

Electrical Engineering. Lehigh University: author of and Construction of Dynamos and Motors-Types of the section on Alternating Current Machinery.

Machines - Storage Batteries, including Theory, ManH. C. CUSHING, Jr., Wiring Expert and Consulting

agement and Types. Engineer: author of the section on Wiring for Light Part III.-Incandescent and Arc Lighting-Electric Railand Power

ways, including Car Wiring. Line Construction. ThirdPROF. DUGALD C. JACKSON, Collaborator with

Rail and Multiple-Unit Systems-Management of DynaPROF. GEORGE C. SHAAD, University of Wiscon

mo-Electric Machinery-Power Station Work, including

Boilers, Engines and Electrical Machinery-High Tensin: author of sections on Power Transmission, Electric Lighting and Central Stations,

sion Transmission. J. R. CRAVATH, Western Editor of the Street Railway

Part IV.-Theory of Alternating Currents-Construction,

Types and Operation of Alternators, Transformers, InJournal: author of the section on Street Railways.

duction Motors, Synchronous Motors and Rotary Con. Mass. Institute of Technology:

verters. WILLIAM BOYRER, Telephone Expert and Consult

| Part V.-The Telephone - Instruments - Line Construcing Engineer: CHAS. THOM, Chief of Quadruplex

tion-Switchboards - ExchangesDepartment Western Union Telegraph Co.: author of

Operation and Maintenance-Comsection on Telegraphy, and others.

mon Battery System. - 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.)

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Name........

St. Address...
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State.

AMERICAN SCHOOL of CORRESPONDENCE At ARMOUR INSTITUTE OF TECHNOLOGY, CHICAGO

Mention The Technical World.

FOR YOUR DESK

GRADUATE AND STUDENT NOTES - (Continued

TAZEWELL GILMER, Brooklyn, N. Y., has successfully passed the Civil Service Examination.

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Elbert Hubbard, The

Roycrofters," E Aurora, N. Y.: "I think that your cabi. net has added several years to my earth life by enabling me to find the thing without wear or tear on my temper and vocabulary."

JOHN J. WHEELER, a graduate of the Armour Institute, Class of '97, in Mechanical Engineering, and at present enrolled in the American School in the Electrical Department, is Instructor at the Tuskegee (Ala.) Institute in Mechanical Engineering.

Geo. H. Daniels, Gen'l

Pass's Agent, N. Y.
C. & H. R. Ry. Co.;
"I find them indis.

pensable to me in my
Free to You with! !! work."
Your Name in Gold

Even a gifted writer like Elbert Hubbard can. not 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, manu. scripts, 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 inight otherwise lose or forget-perliaps 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.oo 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

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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 suc.

cess. And, so is SYSTEM, the
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An Error Corrected 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.

THROUGH a misrepresentation of Special Offer

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August number regarding the designing

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takes this opportunity to correct the 992 First National Bank Building. Chicago error.

Mention The Technical World.

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