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Scientific American Supplement, No. 810, July 11, 1891   By:

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NEW YORK, JULY 11, 1891

Scientific American Supplement. Vol. XXXII, No. 810.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.


I. BOTANY. Cocos Pynaerti. A new dwarf growing palm. 1 illustration.

II. CHEMISTRY. The Application of Electrolysis to Quantitative Analysis. By CHARLES A. KOHN, B.Sc., Ph.D. Applicability of these methods to poison determinations.

III. CIVIL ENGINEERING. The Kioto Fu Canal in Japan. A Japanese canal connecting the interior of the country with the sea. 3 illustrations.

The Iron Gates of the Danube. An important engineering work, opening a channel in the Danube. 1 illustration.

The New German Ship Canal. Connection of the Baltic with the North Sea. Completion of this work. 1 illustration.

Transit in London, Rapid and Otherwise. By JAMES A. TILDEN. A practical review of London underground railroads and their defects and peculiarities.

IV. ELECTRICITY. An Electrostatic Safety Device. Apparatus for grounding a circuit of too high potential. 1 illustration.

Experiments with High Tension Alternating Currents. Sparking distance of arc formed by a potential difference of 20,000 volts. 1 illustration.

Laying a Military Field Telegraph Line, Recent field trials in laying telegraph line in England. 3 illustrations.

Some Experiments on the Electric Discharge in Vacuum Tubes. By Prof. J.J. THOMSON, M.A., F.R.S. Interesting experiments described and illustrated. 4 illustrations.

The Electrical Manufacture of Phosphorus. Note upon a new English works for this industry.

V. GEOGRAPHY. The Mississippi River. By JACQUES W. REDWAY. An interesting paper on the great river and its work and history.

VI. MECHANICAL ENGINEERING. How to Find the Crack. Note on a point in foundry work.

Riveted Joints in Boiler Shells. By WILLIAM BARNET LE VAN. Continuation of this practical and important paper. 10 illustrations.

VII. MEDICINE AND HYGIENE. Influence of Repose on the Retina. Important researches on the physiology of the eye.

The Relation of Bacteria to Practical Surgery. By JOHN B. ROBERTS, A.M., M.D. A full review from the surgeon's standpoint of this subject, with valuable directions for practitioners.

VIII. MINERALOGY. Precious and Ornamental Stones and Diamond Cutting. By GEORGE FREDERICK KUNZ. An abstract from a recent census bulletin, giving interesting data.

IX. MINING ENGINEERING. Mine Timbering. The square system of mine timbering as used in this country in the Pacific coast mines and now introduced into Australia. 1 illustration.

X. MISCELLANEOUS. Freezing Mixtures. A list of useful freezing mixtures.

Sun Dials. Two interesting forms of sun dials described. 3 illustrations.

The Undying Germ Plasm and the Immortal Soul. By DR. R. VON LENDENFELD. A curious example of modern speculative thought.

XI. NAVAL ENGINEERING. The New British Battle Ship Empress of India. A first class battle ship recently launched at Pembroke dockyard.

XII. TECHNOLOGY. Composition of Wheat Grain and its Products in the Mill. A scientific examination of the composition of wheat and its effect on mill products.

Fast and Fugitive Dyes. By Prof. J.J. HAMMEL. Practical notes from the dyer's standpoint upon coloring agents.


The square system of timbering, in use in most of our large mines on the Pacific coast, was first introduced in Australia by Mr... Continue reading book >>

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