Scientific American Supplement, No. 623, December 10, 1887   By: Various

SCIENTIFIC AMERICAN SUPPLEMENT NO. 623

NEW YORK, DECEMBER 10, 1887

Scientific American Supplement. Vol. XXIV., No. 623.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

TABLE OF CONTENTS.

I. ARCHITECTURE. Notes on the Construction of a Distillery Chimney A new method of building lofty shafts, including a metallic frame and brick lining 3 illustrations. 9949

The Commercial Exchange, Paris The new Paris exchange now in process of erection. Present state of operations 1 illustration. 9954

II. ASTRONOMY. The Yale College Measurement of the Pleiades. Dr. Elkin's work with the Repsold heliometer at Yale College. 9957

III. CHEMISTRY New Method for the Quantitative Determination of Starch. By A.N. ASBOTH Determination of starch by its barium compound. 9956

Synthesis of the Alkaloids A retrospect of the field of work so far traveled over by synthetical chemists, and future prospects. 9956

The Chemical Basis of Plant Forms By HELEN C. DE S. ABBOTT Continuation of this important contribution to plant chemistry, one of the most valuable of recent chemical monographs. 9955

IV. ELECTRICITY. An Electrical Governor A new apparatus for preserving a constant electromotive force with varying dynamo speed 1 illustration. 9952

Electric Launch A French government launch with Krebs electric motor. 9954

The electric current as a means of increasing the tractive adhesion of railway motors and other rolling contacts. By ELIAS E. RIES A full review of this important subject, with accounts of its experimental examination. 9953

V. ENGINEERING Benier's Hot Air Engine A new caloric engine very fully illustrated and described 8 illustrations. 9943

Heating Marine Boilers with Liquid Fuel A simple apparatus and recent experiments with the same. 3 illustrations. 9945

The Change of Gauge of Southern Railroads in 1886 By C.H. HUDSON. The conclusion of the account of this great engineering feat, with tables of statistics and data 16 illustrations. 9946

Your Future Problems By CHAS. E. EMERY An address to the graduating class of the Stevens Institute, N.J. A practical view of the engineering profession. 9943

VI. MISCELLANEOUS A Group of Hampshire Downs A typical breed of sheep, their qualities and habits. 1 illustration. 9957

VII. NAVAL ENGINEERING The Spanish Cruiser Reina Regente A further description of this celebrated vessel 4 illustrations. 9948

Torpedo Boats for Spain The Azor and Halcon, two Yarrow torpedo boats, described and illustrated 7 illustrations. 9947

VIII. PHOTOGRAPHY How Different Tones in Gelatino chloride Prints may be Varied by Developers. Twenty different formulæ for the above purpose. 9949

Film Negatives Eastman stripping films, their manipulation and development. 9949

IX. SANITATION French Disinfecting Apparatus A portable apparatus for disinfecting clothes and similar objects 1 illustration. 9952