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Scientific American Supplement, No. 388, June 9, 1883   By:

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[Illustration]

SCIENTIFIC AMERICAN SUPPLEMENT NO. 388

NEW YORK, June 9, 1883

Scientific American Supplement. Vol. XV., No. 388.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

TABLE OF CONTENTS.

I. ENGINEERING. Farcot's Improved Woolf Compound Engine. 4 figures.

The "Swallow," a New Vehicle.

Boring an Oil Well.

A Cement Reservoir. 2 figures.

"Flying."

II. TECHNOLOGY. Iron and Steel. By BARNARD SAMUELSON. The world's production of pig iron. Wonderful uses and demands for iron and steel. Progress of Bessemer steel. Latest improvements in iron making. Honors and rewards to inventors. Growth of the Siemens Martin process. The future of iron and steel. Relations between employers and workmen.

Machine for Grinding Lithographic Inks and Colors. 1 figure.

A new Evaporating apparatus. 2 figures.

Photo Plates. Wet and Dry.

Gelatino Bromide Emulsion with Bromide of Zinc.

The Removal of Ammonia from Crude Gas.

III. MEDICINE AND HYGIENE. The Hair, its Uses and its Care. The Influence of Effective Breathing in Delaying the Physical Changes Incident to the Decline of Life, and in the Prevention of Pneumonia. Consumption, and Diseases of Women. By DAVID WARK. M.D. Pneumonia. The true first stage of Consumption. The development of tubercular matter in the blood. The value of cod liver oil in the prevention of consumption. The influence of normal breathing on the female generative organs Showing how the breathing powers may be developed. The effects of adequate respiration in special cases.

Vital Discoveries in Obstructed Air and Ventilation.

IV. ELECTRICITY. The Portrush Electric Railway, Ireland. By Dr. EDWARD HOPKINSON.

The Thomson Houston Electric Lighting System. 4 figures.

A Modification of the Vibrating Bell. 2 figures.

V. CHEMISTRY. Acetate of Lime.

Reconversion of Nitroglycerine into Glycerine. By C.L. BLOXAM.

Carbonic Acid and Bisulphide of Carbon. By JOHN TYNDALL.

VI. AGRICULTURE AND HORTICULTURE. Propagation of Maple Trees.

Dioscorea Retusa. Illustration.

Ravages of a Rare Scolytid Beetle in the Sugar Maples of Northeastern New York. Several figures.

The Red Spider. 4 figures.

Japanese Peppermint.

VII. NATURAL HISTORY. The Recent Eruption of Etna.

The Heloderma Horridum. Illustration.

The Kangaroo.

VIII. ARCHITECTURE. Design for a Villa. Illustration.

IX. BIOGRAPHY. William Spottiswoode. Portrait.

X. MISCELLANEOUS. Physics without Apparatus. Illustration.

The Travels of the Sun.

FARCOT'S IMPROVED WOOLF COMPOUND ENGINE.

In a preceding article, we have described a ventilator which is in use at the Decazeville coal mines, and which is capable of furnishing, per second, 20 cubic meters of air whose pressure must be able to vary between 30 and 80 millimeters.

In order to actuate such an apparatus, it was necessary to have a motor that was possessed of great elasticity, and that nevertheless presented no complications incompatible with the application that was to be made of it.

In the ventilation of mines it has been demonstrated that the theoretic power in kilogrammes necessary to displace a certain number of cubic meters of air, at a pressure expressed in millimeters of water, is obtained by multiplying one number by the other. Applying this rule to the case of 20 cubic meters under a hydrostatic pressure of 30 millimeters, we find:

20 × 30 = 600 kilogrammeters.

In the case of a pressure of 80 millimeters, we have:

20 × 80 = 1,600 kilogrammeters... Continue reading book >>


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