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THE FREDERICK POST CO. 28 Reade Street, NEW YORK

214-220 South Clark Street, CHICAGO

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"SPUR" YOUR BOAT

If you are building a new boat and want to get the greatest speed its lines will allow, or if you have a boat which has not developed the pace you expected, investigate

The Cushman Motor

It never disappoints; it surpasses expectations. The least weight for the power developed makes it the Best Boat Motor on the market.

The New 1905 Model is better than ever. The engine proper is valveless.
The cylinder, water jacket and head are cast in one piece. It is the simplest
as well as the most efficient.

THE CUSHMAN MOTOR holds many speed records. Made in Single, Double, Three and Four
Cylinder patterns, at prices which make it an economical engine to buy. Handsome
catalogue In press. Write now for booklet and circulars. Agents wanted in leading markets.
We make a full line of Stationary Engines and Automobile Motors.

Cushman Motor Company,

2014 N. St., Lincoln, Neb., U. S. A.

Member National Association Engine and Boat Manufacturers.
See our Exhibit, National Motor Boat Show, Madison Square Garden, N. Y., Feb. 21-March 9.

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LUNKENHEIMER

"HANDY" GATE VALVES

Designed and guaranteed for working pressures not to exceed 75 pounds. For higher pressures we recommend our Lever Throttle Valves made of both Brass & Iron. The discs have ball and socket bearing between them insuring an even bearing against the tapered seat.

Discs will remain in any position placed.

Valve can be operated by rod or rope from a distance. Specify LUNKENHEIMER "Handy" and order from your dealer.

Made in brass, sizes 1⁄2 to 4 inches inclusive and iron body, brass mounted from 2 to 8 inches inclusive, also made in acid metal.

Can be had with English standard pipe threads. Cut this out, send to us, and we will mail you a copy of our catalogue.

The LUNKENHEIMER COMPANY Largest Manufacturers of Engineering Specialties in the World Main Offices & Works: Cincinnati, Ohio, U.S.A.

Branches:

New York, 26 Cortland St. Philadelphia. 1428-32 Callowhill St.
New Orleans, Tulane - Newcomb Building.
London, 35 Great Dover St.
Paris, 24 Boulevard Voltaire.

23

CONSULTING DEPARTMENT-(Continued)

Water Pressure in Pipes

Question: Can you give me a short and accurate formula by which I can determine the pressure, per square inch, against which a steam pump has to work in the following cases?

(1) When length of line and vertical elevation are given;

(2) When length of line only is given, straight.

In neither instance is friction to be considered. -J. L. B.

Answer: Neglecting the friction of the water flowing in pipes, the only pressure to be overcome is that due to the static head. In Case 1, then, the only pressure is that due to the elevation. Knowing the elevation or head in feet, the pressure per square inch is found by multiplying the head in feet by .433. The only additional pressure required by the length of the pipe, is that due to the friction; and since you state that this is to be neglected, the pressure determined as above covers your question.

In Case 2, where the length of the line only is given, the pressure cannot be determined, since, as explained above, the

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THE LOCKE ADDER, only pressure would be that due to the

Buy a Locke Adder

THE ENGINEER

is a power plant paper for engineers-for those who install, operate and care for machinery, whether steam, electric, gas or hydraulic.

The issues of one year contain about one thousand pages of reading matter. The articles are in the highest degree educational, and of the most authoritative character. Every phase of every power plant subject is treated in a manner both popular and interesting. ISSUED TWICE A MONTH. ONE DOLLAR A YEAR Write for free sample copy. The ENGINEER PUBLISHING COMPANY 357 Dearborn Street, CHICAGO, ILL.

friction of the water in the pipes. Neglecting the friction of the pump, but taking into consideration the friction of the pipes, the necessary steam pressure can be found in each case by adding the pressure due to the static head to the pressure required to overcome the friction in the pipes. The friction loss in pounds per square inch for each 100 feet of length is generally given in pump catalogues. You will find this friction loss to vary in any one size of pipe, about as the square of the velocity. Also the friction loss due to a given quantity of water flowing through a pipe, will be considerably less as the diameter of the pipe in

creases.

Carrying Power of Transformer

Question: If a transformer is rated at 500 watts at 1,000 volts primary, and 5 amperes at 50 volts secondary, or 10 amperes at 100 volts secondary, will this transformer carry 1,000 watts at 100 volts secondary?-M. G. IV.

Answer: In the first place, you probably mean that the transformer supplies

Mention The Technical World.

PENBARTHY

WHEN ALL AT SEA

As to the best Boiler Feeder for your plant, pin your faith to

The Penberthy
Automatic Injector

It can be trusted to give always the same unvarying satis-
factory service. Its record for handling hotter water
starting at the lowest pressure, and working at highest
pressure, has made it a favorite with over 350,000 engineers.
Follow their example and get the best.

The Penberthy
Low Water Alarm

differs from the usual "column" type, and is in every way
better and surer. It cannot be stopped by lime or sedi-
ment, and has been proven by every test absolutely reliable.
Best and costs less.

Every engineer should have our catalog ready for instant reference.

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Write for it to-day,

PENBERTHY INJECTOR COMPANY,

365 HOLDEN AVENUE, DETROIT, MICHIGAN, U. S. A.

Largest Manufacturers of Injectors in the World.

PENBERTHY INJECTOR COMPANY, LTD.,

WINDSOR, ONT.

Penberthy Bulletin sent free

for three months.

This is what one customer has to say about the Dies we send out with our Pipe Cutting and Threading Machines:

We bought our machines
over twenty-five years
ago, and are using some
of the original dies today.

Let us tell you about the lasting qualities and small repair bills. Our machines are the Standard. Made in all sizes, for cutting and threading 14" to 18" pipe.

Bignall & Keller Mfg. Co.

Leclaire, Edwardsville, Illinois

CONSULTING DEPARTMENT-(Continued)

10 amperes at 50 volts secondary, or 5 amperes at 100 volts secondary, because, if it is a 500-watt transformer, the output should not exceed this amount. In order to obtain a secondary voltage of 100, you would need to double the primary voltage; and this would probably cause sufficient heating to destroy your transformer, which is not designed for such voltage. Moreover, you could not expect to obtain double the output for which the transformer was designed.

From the standpoint of copper, there would be no difficulty, as your current would be no greater than before; but if the flux paths of your transformer are designed for 500 watts and a definite primary and secondary voltage, you could not expect to double these factors, and it is evident that you could not reasonably hope to obtain 1,000 watts from your 500-watt piece of apparatus. If your secondary is wound in two sections, then, by connecting the two in series, you could obtain 5 amperes at 100 volts; and by connecting them in parallel, you could obtain 10 amperes at 50 volts.

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Have You Success? If your primary is wound in two sec

Every man contains within himself that
which leads to success or failure, accord-
ing as he makes use of it.

Do you know that Jay Gould who died worth $100,000,000 began by selling rat-traps; that Carnegie worked for $3.00 per week; that Schwab was a cart-boy? There was a method by which these men succeeded. You are starting in life, get the method, it is contained in "HOW TO ATTAIN SUCCESS."

"HOW TO ATTAIN SUCCESS" is a text-book for those who will have success-it's not filled with nicely spun theories, but gives the master-key to your capacity and powers.

A $60.00 man writes he studied its principles hard and now has an income in the five figures. YOU CAN DO THE SAME - IT'S ONLY LEARNING AND DEVELOPING YOUR OWN POWERS AND

FOROES-do this, success will be yours.

"HOW

To the ambitious man or woman possessed of energy TO ATTAIN SUCCESS" will unfold a world of possibility. will transform hope of success into realization. Sent on receipt of $1. CHAS. VANAGH,

Room 8. 992 Harrison St., Chicago.

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tions normally giving 500 watts at 1,000 volts, you can impress 2,000 volts on the primary by putting the two primary sections in series.

Effect of Equalizer

Question 1: Two direct-current machines, one shunt-wound and one series-wound, are running in multiple. Does the equalizer affect the shunt in keeping them in balance?

Question 2: How does a machine get reversed with the equalizer in, when two machines are running in parallel?—T. M.

Answer 1: A series and a shunt machine could not be operated in parallel. The equalizer would do no good in this case in assisting the machines to keep at the same voltage. In fact, a series machine is in very unstable equilibrium when used in parallel operation, even with another series machine, unless special connections are made.

Answer 2: When two machines are running in parallel, if the voltage of one machine falls very decidedly for any

Mention The Technical World.

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STARRETT
TOOLS

are the standard for accuracy, workmanship, design and finish. Whether you use tools to earn your daily bread

or for amusement and relaxation from a different vocation, it pays to use GOOD tools. You can get a better quality of bread and a good deal more pleasure.

Use Starrett Tools.

Athol, Mass, U. S. A.

Send for Catalogue No. 17G. 176 pages, illustrated, free

THE L. S. STARRETT CO.

No. 84

CRANE RENEWABLE SEAT AND DISC VALVES

The Renewable parts are made of hard and superior composition; far better than the usual composition put into Valves, and we do not hesitate to say they will last many times longer than those in the ordinary Valve.

They are especially suitable for any hard work where extreme pressure is used and where the wear and tear on the Valve is most severe.

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