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National Builder

Fred T. Hodgson, Editor

A PRACTICAL Building Monthly Journal. Each issue contains a manila supplement 24 x 36 showing the complete plans of a buildinc drawn to • scale with full details. A detailed estimate accompanies it. The reading paces contain live matter on important subjects such as Hollow Block Construction, Styles of Architecture, Builders' Tools, etc., etc.

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Multiplying the M. E. P. of the intermediate cylinder by 4/9, we would have the pressure referred to the low cylinder.

Similarly, the pressure on the high can be determined; and if we add the M. E. P. of the high and intermediate (referred to the low) to the M. E. P. of the low itself, we have the total M. E. P., or the value of P in the formula. Of course the M. E. P. mentioned above cannot be determined accurately without the aid of the indicator diagram.

If the piston speed in feet per minute is given, then the terms L and N in the formula can be omitted, and the piston speed substituted.

Cement for Leather

Question: Give formula for quick-setting cement for leather belts, that oil will not affect.—/.. IV. N.

Answer: Take 16 parts gutta-percha. 4 India rubber, 2 pitch, 1 shellac, 2 linseed oil. Cut small, melt together, and mix well.

Resistance of Ground

Question: Please give me formula for the resistance of a ground by the voltmeter method.—/7. W. W.

Aiiszvcr: This can be found by using a Weston voltmeter as follows: Connect one side of the circuit to one bindingpost of the voltmeter, and connect a water pipe to the other binding-post of the voltmeter. If now there is any deflection, we know that there is a ground on the opposite side of the circuit from that to which the voltmeter is connected. The resistance of this ground may be found by the formula:

R-r ( v- - 1 ).

in which R equals the resistance of the ground leak required; r equals the resistance of the voltmeter: V equals voltage between the positive and negative sides of the line; and v equals the reading of the instrument.

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NEW YORK 32 Cortlandt St. 39 Der St. JERSEY CITY 42-40 Essex St. 4 1-47 Morris St.

Stately Homes in America


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THIS work illustrates the development of fine residences
built in this country from the Colonial period to date.
Many fine homes are pictured for the first time — the
great Vanderbilt Mansions and others of that class. The text is
a serious attempt to explain social and economic conditions and
the architectural developments which have produced these
sumptuous buildings.

Architectural Record, 14-16 Vesey St., New York

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A Well-Deserved Honor

•"THE CHAIR of English Literature in •t Armour Institute of Technology, rendered vacant by the call of Prof. F. M. Tisdel to the presidency of the University of Wyoming, has been filled by the appointment of Dr. William A. Colledge, Dean of the American School of Correspondence. This means, of course, a loss to The Technical World, for with this number Doctor Colledge severs his active connection with the editorial board of the magazine. We congratulate Doctor Colledge on the enlarged opportunities opened up to him in his new field as a member of the Faculty of Armour Institute of Technology, and the Institute on securing his services. The Editors hope still to be favored with his able advice on matters connected with the magazine.


Electricity in India

HTHIS GREAT ENERGY, which is *■ the leading feature of the day in nearly all parts of the world, but chiefly in America, has of late years been making gradual progress in the greatest of British possessions in the East.

Commencing from the south, it may be interesting to note how the Government of Mysore has endeavored to improve her state by the use of electricity derived from power from the natural waterfalls of the Cauvery. Gold mining by this great unknown power has already proved a success, and various large extensions and improvements under leading British and American firms are in progress.

The Presidencies of Madras and Bombay, though somewhat late in the field, have at present schemes for the improvement of their capitals; and even the great

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Penberthy Injector Company

365 Holden Avenue, Detroit, Mich., U. S. A.

Penberthy Bulletin sent free on request for Three Months

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Nijam of Hyderabad has sanctioned the use of electricity within his dominions.

Bengal, the greatest Presidency in India, has not been idle, having lately installed electric tramways and lighting, with various other improvements, in her capital, known as the "City of Palaces" in history; and even the Northwest Provinces, since the Durbar of 1903 at Delhi, where the benefits of electricity were seen with advantage, have been stirred to seek to improve their districts.

The great problem of the day. however, lies in irrigation and agriculture; and once a suitable scheme is found, in which cost and maintenance are not too great for practical demonstration, then will India rise to the height of her ambition.—Ernest Charles Deefholtz, Student, American School.

Recently Graduated

THE FOLLOWING STUDENTS have been graduated from the American School of Correspondence since the last number of The Technical World was issued:

Chapin, C. C. Sloan, Iowa—Course: Mechanical-Electrical.

Dollinger, Joseph L. S., San Francisco, Cal.— Course: Mechanical-Electrical.

Ferris, William Can by, Memphis, Tenn.— Course: Mechanical-Electrical.

Frederickscn, George H.. Chicago. 111.— Course: Mechanical-Electrical.

Pierce, Glen, Lawler, Iowa—Course: Stationary.

Poutier. Stephen, Buffalo, N. Y.—Course: Mechanical.

Riesebeck, Ernest. Petoskcy, Mich.—Course: Electrical.

Thomas, Alfred S.. Dunedin, New Zealand— Course: Marine.

Mr. Charles Lundelius, of Niagara Falls, N. Y., has been awarded a set of the "Cyclopedia of Engineering" as a premium for securing the largest number of subscribers to The Technical World within the time specified in accordance with one of the Premium Offers. Go thou and do likewise.

Mr. Harry A. Munvon, of Oxford. New York, a student of the Mechanical

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