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Scientific American Supplement. Vol. XV., No. 388.
Scientific American Supplement, $5 a year.
Scientific American and Supplement, $7 a year.
I. ENGINEERING.--Farcot's Improved Woolf Compound Engine.--4 figures.
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.
Gelatino Bromide Emulsion with Bromide of Zinc.
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.
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.
Ravages of a Rare Scolytid Beetle in the Sugar Maples of Northeastern New York.--Several figures.
VII. NATURAL HISTORY.--The Recent Eruption of Etna.
VIII. ARCHITECTURE.--Design for a Villa.--Illustration.
IX. BIOGRAPHY.--William Spottiswoode.--Portrait.
X. MISCELLANEOUS.--Physics without Apparatus.--Illustration.
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.