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Engineering News

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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: A X M. E. P. × S 33,000

I. H. P.

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In the above formula, A is the area of the piston in square inches; and S is obtained by multiplying the stroke in feet by one-half the number of revolutions per minute.

Answer 4: The diameters and weights of fly wheels vary to a considerable extent, among engines turned out by different builders. The exact weights depend upon the character of the work done by the engine. For pumping and machine work, the effort need not be as constant as for electric lighting and other fine work. To determine the weight, the diameter of the wheel must be known, or the ratio of the diameter of the wheel to the length of the stroke. In any case, 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.): 6,000 3.1416 X diameter X 800. From this formula, the diameter is found to be 2.4 feet.

Mention The Technical World.

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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.
UP-TO-DATE 1904 EDITION

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The 20th Century Hand-Book FOR ENGINEERS

and ELECTRICIANS

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A 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 illus
trated, 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 edu-
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 engineer 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 description of alternating current instruments and machinery. No better or more complete electrical part of a steam engineer's book was ever written 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 5x6x1 inch thick. PRICE NET

ELECTRICITY MADE SIMPLE

By CLARK CARYL HASKINS

JUST the book for beginners and electrical workers whose opportunities for gaining information 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 the 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 ele-
mentary principles is gaining for it a reputation as a textbook for schools and colleges.
12mo, Cloth, 233 pages, 108 illustrations - PRICE NET

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The Most Important Book on Electrical Construction Work for Electrical Workers
Ever Published.
4
FIFTH EDITION

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.

The book contains no pictures of bells, batteries or other fittings; you can see those anywhere.
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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.
How to install and manage batteries.
How to test batteries.
How to test circuits.

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.

16mo, 160 pages, 200 illustrations, full leather binding, round corners, red edges. Size 4 x 6, pocket edition.
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Frederick J. Drake & Co., 200-211 East Madison Street, CHICAGO

Publishers of Self-Educational Books for Mechanics

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in which C is a constant that varies for different conditions (for ordinary work it is about 700,000); d is the diameter of the cylinder in inches; b is the length of stroke in inches; D is the diameter of fly wheel in feet; N is the number of revolutions per minute; and W is the weight of the rim in pounds.

Knowing the diameter of the fly wheel, the width of the face and thickness can be determined, since the weight is considered as being in the rim. If b equals the width of the face in inches, t the thickness of rim in inches, and d the diameter of fly wheel in inches, we then have:

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Pure platinum.. 0.40

This battery is interesting from at scientific rather than a commercial standpoint.

Mention The Technical World.

A SCHOOL

T

WITHIN ITSELF

HERE are XIX chapters of subjects, carrying you from the fundamental principles of electricity on through the various branches to a point where the careful student comprehends the complete designing, care and operation of a dynamo or motor. Each subject is carefully written and to the point. After a student studies a subject, he is questioned on that subject in such a manner as to bring clearly to his mind the points he needs to know regarding same. A DICTIONARY in back of book will enable him to learn the meaning of any electrical word, term or phrase used in this book, as well as hundreds of others in common use. All required tables necessary in the study are in it.

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$2.00 per Copy-Third Edition-11,000 Copies Sold The offer we make of refunding money if book is

not satisfactory upon examination is AN UNUSUAL ONE in connection with the sale of a book. But we have no fear of its return. Your decision will be what thousands of others have been. Money would not buy it if it could not be duplicated. We could print testimonials by the hundreds. It is best to order and be your own judge of its merits.

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