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There is Dynamite in this
for Old Foggy Ideas

T ULLEY’S Handbook treats on many pet theories and aims at the

motto: “Strenuousness is Life.” There is no time now to read all moonzus of the hundreds of good books, each taking up a particular field.

Some one must concentrate them and thus at one stroke give you the best thoughts found in each. Keep you fully informed and save you time for other duties.

Tulley's Handbook does this for you. The modern uses of Light, Heat and Power are so closely allied that it is the duty of one book to cover those fields.

Any one interested in the use of power in any form, or the use of light in any shape, or of heat can by the exper

HANDBOOK ON ENGINEERING, ience of others profit in a liberal measure and get much more from their investment than by ignoring such information. How can you do it? TULLEY'S HANDBOOK does this for you.

If in this way you can get ten (10) per cent more power from your boiler or your engine, or obtain ten (10) per cent less wear in machinery in general, or make your coal go a tenth farther, or make your dynamo produce a tenth more light, or your electric system give ten (10) per cent better efficiency, or your waste steam furnish more heat to your building, think what it means to you in a year.

A man's success is largely due to his ability to learn things, and to put what he knows into practice. TULLEY'S HANDBOOK will give you the facts. Can you afford to go without it? It contains the kind of knowledge that helps men to succeed. When in doubt buy TULLEY'S HANDBOOK. You will make no mistake.


Sent Anywhere ond
Receipt of Price

Money back if
not Satisfactory

. Send for Illustrated Circular " HENRY C. TULLEY & co. 7 Wainright Building, Saint Louis, Mo., U. S. A.

Mention The Technical World.

Lest You Forget


CONSULTING DEPARTMENT-(Continued) Answer: We think that you must refer to different positions of the boom rather than to different heights of the load, for it is a fact that the height of the load in no way affects the tendency of the derrick to overturn. Referring to the figure, you will see that the load is shown in two places in full lines, and in two places in dotted lines. For any one position of the boom, the turning moment is constant for a given load. In



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A hand-
some prac-
tical little re-
minder, size
272 x 434, just
fits the vest pocket.
Genuine black flexi-
ble Morocco covers
with pocket and pencii,
$1.00 postpaid, including 50 sheets in book,
50 extra sheets and name in gold on front
cover. Press a thumb - spring, the book
opens for inserting or removing sheets.
Close and it locks automatically.

A wonderful little device. You cannot afford to be without it. Special prices in

the first case, where the boom is shown quantities for advertising souvenirs. Send nearly vertical, the tendency to turn $1.00 today in currency, check, money

about the center line of the mast would order or stamps. Money refunded if book not satisfactory. With every order three

be Wd; and, supposing the derrick car months' subscription to Tengwall Talk, a C to be supported on the line passing bright monthly Magazine of Modern Busi through the center of the mast, the ness Methods. Add 12 cents for postage in

tendency to overturn about this support the United States; 16 cents for postage in parcel post countries; 48 cents for postage in

would be expressed by the moment Wd. other foreign countries.

The tendency of the car to resist this T. S. Spencer, of High Point, N. C., overturning, is expressed by its weight writes:

multiplied by the distance L, which rep"I received the Pocket Memo last

resents the distance of the center of pight and am entirely satisfied with it. Think it is the neatest and most con

gravity from the center line of support venient little book I ever saw. I thank you for your promptness and my mon

under consideration. If the weight W is ey's worth."

such that when the boom is nearly verti

cal the car just balances the weight, then, Tengwall Loose-Leaf Devices save time

when the boom is swung to the horiand money.

zontal position shown, the car will over

turn. Since the moment now is WxB, Correspondence solicited concerning looseleaf devices and supplies of all kind.

in which B represents the distance from the end of the boom to the center line

of the mast, the tendency to turn in the TENGWALL

horizontal position is as much greater FILE & LEDGER CO. than that in the nearly vertical position,

as the distance B is to D. CHICAGO.

For formulas relating to derricks, see THE TECHNICAL WORLD, Vol. I, No. 4

(June, 1904), page 474. Mention The Technical World.

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Responsible Positions

Are Open

Engineering News

Established 1874
Published Thursdays

If you must change your position follow the Situations Open and Civil Service Departments in this journal. Very important positions vacant are noted in these pages.

Small cards in the Situations Wanted pages have brought most satisfactory results to many. Rates for Situations Open and Situations Wanted cards are 132 and 2 cents a word set solid. The following are from letters by persons

using our pages: "It was through your columns that I met with success."

"I have filled the position from here. Your paper is a good advertising medium."

"I obtained a position through the advertisement in your paper the first week."

Fly Wheel for Gasoline Engine Question 1: I have designed an 8-H. P. gasoline engine. I want to know what sized fly wheel I should use on this engine, the same being a 6x6 and to run at 800 R. P. M. What diameter, width of face, and thickness of same, the fly wheel to be a 5-spoke style?

Question 2: What will be the approximate weight of wheel?

Question 3: How do you calculate the H. P. of a gasoline engine, size 6-inch bore, 6inch stroke, and 800 R. P. M.?

Question 4: How do you calculate the size and weight of a fly wheel, the H. P. of engine given?-C. S.

Answer 1: From the data which you have given, the diameter of the fly wheel should be 28 inches, width of face 8 inches, and thickness 2 inches.

Answer 2: The weight should be about 350 pounds.

Answer 3: Having given the dimensions of the cylinder and the speed, the only other variable quantity is the working fluid. With gasoline, the average M. E. P. is assumed to be 60 pounds. Applying these values to the formula:

Send for circular "T-W."and sample copy of paper.
St. Paul Building, New York

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Standard Books

Kidder, Ph. Dine Architects, anch edition, 421

we have:
I. H. P. = ?
28 X 60 X 200

= 10.2 H. P.


In the above formula, A is the area of FOR

the piston in square inches; and S is ob

tained by multiplying the stroke in feet Students and Draftsmen.

by one-half the number of revolutions

per minute. Vignola-The Five Orders of Architecture. Second edition. By ARTHUR LYMAN TUCKERMAN. For the

Answer 4: The diameters and weights use of the Art Schools of the Metropolitan Museum of Art; one quarto volume; cloth. Price, $5.00.

of fly wheels vary to a considerable exBuilding Construction and Superintendence. By F. E.

tent, among engines turned out by difKIDDER, PH.D., F. A. I, A., Consulting Architect, and author of "The Architects, and Builders' Pocket ferent builders. The exact weights deBook," Part I--Mason's Work, 6th edition, 421 pages, 260 illustrations: price, $1.00. Part II Carpenters'

pend upon the character of the work done Work, 4th edition, 514 pages, 525 illustrations; price, $4. by the engine. For pumping and ma

Architectural Perspective for Beginners. By F. A. WRIGHT, Architect. One large quarto; handsomely

chine work, the effort need not be as bound in cloth. Price, $3.00.

constant as for electric lighting and other Practical Lessons in Architectural Drawing: or, How to Make the Working Drawings for Buildings. By fine work. To determine the weight, WM. B. Tuthill, A. M., Architect. Eleventh edition,

the diameter of the wheel must be known, large 8vo volume, oblong, cloth. Price, $2.50.

or the ratio of the diameter of the wheel Catalogue of Architectural and Technical Books

to the length of the stroke. In any case, on request.

the maximum linear velocity should not be greater than 6,000 feet per minute. Taking this maximum, we have (since

the engine is to run at 800 R. P. M.): Publisher,

6,000 = 3.1416 x diameter x 800. 23 Warren Street, New York.

From this formula, the diameter is found

to be 2.4 feet. Mention The Technical World.

Wm. T. Comstock,

The 20th Century Hand-Book and ELECTRICIANS

The Latest, Best and Most Complete Book on Engineering and Electricity Published. Written by Practical Engineers and Electricians in a Way That You Can Understand It.



and ELECTRICIANS COMPENDIUM of useful knowledge appertaining to the care and man

agement of Steam Engines, Boilers and Dynamos. Thoroughly practical with full instructions in regard to making evaporation tests on Boilers. The adjustment of the slide valve, corliss valves, etc., fully described and illustrated, together with the application of the indicator and diagram analysis. The subject of hydraulics for engineers is made a special feature, and all

problems are solved in plain figures, thus enabling the man of limited eduSTEAMENGINTERS AND FIECTR

cation to comprehend their meaning.

By C. F. Swingle, M. E., formerly Chief Engineer of the Pullman Car Works, Late Chief Engineer of the Illinois Car and Equipment Co., Chicago.


Electrical Division The electrical part of this valuable volume was written by a practical engi. neer for engineers, and is a clear and comprehensive treatise on the principles, construction and operation of Dynamos, Motors, Lamps, Storage Batteries, Indicators and Measuring Instruments, as well as an explanation

of the principles governing the generation of alternating currents, and a ESTIONS AND ANSW

description of alternating current instruments and machinery. No better or more complete electrical part of a steam engineer's book was ever writ

ten for the man in the engine room of an electric lighting plant, Swingle's 20th Century Hand-Book for Engineers and Electricians, 507 pages, over 300 illustrations - Handsomely

bound in full leather, pocket-book style, size 5x634x1 inch thick. PRICE NET . . . . . . . .




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TUST the book for beginners and electrical workers whose opportunities for gaining infor

mation on the branches of electricity have been limited. A book devoid of technicalities. Simple, plain and understandable. There are many elementary books about electricity upon the market, but this is the first one presenting tbe matter in such shape that the layman may understand it, and at the same time, not written in a childish manner. For engineers, dynamo men, firemen, line.nen, wiremen and learners. For study or reference. This little work is not intended for the instruction of experts, nor as a guide for professors. The author has endeavored throughout the book to bring the matter down to the level of those whose opportunities for gaining information on the branches treated have been limited.

Four chapters are devoted to Static Electricity: three each to Chemical Batteries and Light and Power; two each to Terrestrial Magnetism and Electro-Magnetism; one each to Atmospheric Electricity; Lightning Rods; Electro-Chemistry; Applied Electro-Magnetism; Force; Work and Energy; Practical Application of Ohm's Law; also a chapter upon Methods of Developing Electricity, other than Chemical.

The large number of examples that are given to illustrate the practical application of elementary principles is gaining for it a reputation as a textbook for schools and colleges.


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. $1.00 PUTRI


The Most Important Book on Electrical Construction Work for Electrical Workers
Ever Published.


Modern Wiring Diagrams and Descriptions

A Handbook of Practical Diagrams and Information for Electrical Workers
By HENRY C. HORSTMANN and VICTOR H. TOUSLEY, Expert Electricians

THIS grand little volume not only tells you how to do it, but it shows you.
1 The book contains no pictures of bells, batteries or other fittings; you can see those anywhere.
It contains no Fire Underwriters' rules; you can get those free anywhere.

It contains no elementary considerations, you are supposed to know what an AMPERE, a VOLT or
a “short circuit” is. And it contains no historical matter.

All of these have been omitted to make room for "DIAGRAMS AND DESCRIPTIONS" of just such a character as WORKERS need. We claim to give all that ordinary electrical workers need and nothing that they do not need. It shows you how to wire for call and alarm bells; for burglar and fire alarm. How to run bells from dynamo current.

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How to test batteries.

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How to wire for annunciators, for telegraph and gas lighting.
It tells how to locate "trouble" and "ring out" circuits. It tells about meters and transformers,
It contains 30 diagrams of electric lighting circuits alone.
It explains dynamos and motors, alternating and direct current.
It gives ten diagrams of ground detectors alone.

It gives "COMPENSATOR" and storage battery installation.
It gives simple and explicit explanation of the “WHEATSTONE" Bridge and its uses as well as volt-meter and other testing.
It gives a new and simple wiring table covering all voltages and all losses or distances.

wiring table not the NSATORRAD na dotterdating tacuits alone. It tells ab,

16mo, 160 pages, 200 illustrations, full leather binding, round corners, red edges. Size 4 x 6, pocket edition.

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By mentioning "THE TECHNICAL WORLD”, we will send all the books advertised in this page for $4.00 prepaid. Your money back if books are not as represented. Send for catalogue.

200-211 East Madison Street, CHICAGO

Publishers of Self-Educational Books for Mechanics

Mention The Technical World.

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