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Scientific American Supplement, No. 803, May 23, 1891   By:

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[Illustration]

SCIENTIFIC AMERICAN SUPPLEMENT NO. 803

NEW YORK, May 23, 1891

Scientific American Supplement. Vol. XXXI., No. 803.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

TABLE OF CONTENTS.

I. ASTRONOMY. The Great Equatorial of the Paris Observatory. The new telescope recently put in use in Paris. Description of the instrument and of its effects. 3 illustrations

II. CHEMISTRY. An Apparatus for Heating Substances in Glass Tubes under Pressure. By H. PEMBERTON, Jr. A simple apparatus for effecting this purpose, avoiding risk of personal injury. 2 illustrations

Table of Atomic Weights. A revised table of atomic weights, giving the results of the last determinations, and designed for every day use

Testing Cement. A laboratory process for testing Portland cement

III. CIVIL ENGINEERING. The Compressed Air System of Paris. An elaborate review of this great installation for the transmission of power. The new compressed air station, with full details of performances of apparatus, etc. 10 illustrations

IV. ENTOMOLOGY. Report on Insects. Continuation of this report on noxious insects. Their habits and how to cope with them. 18 illustrations

V. FLORICULTURE. Lily of the Valley. Practical notes on the cultivation of this popular flower. How to raise it and force the growth

VI. MATHEMATICS. The Conic Sections. By Prof. C.W. MACCORD. Examination of the four conic sections with a general definition applicable to all. 6 illustrations

VII. MECHANICAL ENGINEERING. The Builders of the Steam Engine The Founders of Modern Industries and Nations. By Dr. R.H. THURSTON. Prof. Thurston's address before the Centennial Celebration of the American Patent System at Washington, D.C. The early history of the steam engine and its present position in the world

VIII. MISCELLANEOUS. The Breeds of Dogs. Popular description of the different breeds of dogs most affected by amateurs. 6 illustrations

IX. NAVAL ENGINEERING. Modern Armor. By F.R. BRAINARD. The development of modern ship armor, from laminated sandwiched and compound types to the present solid armor. 9 illustrations

X. PISCICULTURE. Restocking the Seine with Fish. The introduction of 40,000 fry of California trout and salmon, designed to restock the Seine, depopulated of fish by explosions of dynamite used in breaking up the ice. 1 illustration

XI. RAILWAY ENGINEERING. Improved Hand Car. A novelty in the construction of hand cars, avoiding the production of a dead center. 1 illustration

XII. TECHNOLOGY. The Tanning Materials of Europe. The natural tanning materials and pathological or abnormal growth tanning materials described and classified, with relative power

THE GREAT EQUATORIAL OF THE PARIS OBSERVATORY.

The great instrument which has just completed the installation of our national observatory is constructed upon the same principle as the elbowed equatorial, 11 in. in diameter, established in 1882, according to the ingenious arrangement devised as long ago as 1872, by Mr. Loewy, assistant director of the Paris Observatory.

We shall here recall the fact that the elbowed equatorial consists of two parts joined at right angles. One of these is directed according to the axis of the world, and is capable of revolving around its own axis, and the other, which is at right angles to it, is capable of describing around the first a plane representing the celestial equator. At the apex of the right angle there is a plane mirror of silvered glass inclined at an angle of 45 deg... Continue reading book >>


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