SCIENTIFIC AMERICAN SUPPLEMENT NO. 520
NEW YORK, DECEMBER 19, 1885
Scientific American Supplement. Vol. XX, No. 520.
Scientific American established 1845
Scientific American Supplement, $5 a year.
Scientific American and Supplement, $7 a year.
TABLE OF CONTENTS.
I.ENGINEERING, ETC.—Steel Structures.—Best use of different      grades of steel.—From a paper by Mr. JAS. CHRISTIE.
Natural Gas Fuel and its Application to Manufacturing:      Purposes.—Paper read before the Iron and Steel Institute by      Mr. ANDREW CARNEGIE.—First use of the gas.—Wells near      Pittsburg.—Extent of territory underlain with gas.—Cost of      piping.—Analyses ofnatural gas.
A Gas Engine Water Supply Alarm.—1 figure.
The Water Supply of Ancient Roman Cities.—An address by      Prof. W.H. CORFIELD.—Aqueducts for the supply of      Borne.—The aqueduct bridge Pont du Gard.—The supply of      Lyons.—Construction of underground aqueducts.
Steam Engine Economy.—By Chief Engineer J. LOWE,      U.S.N.—With diagram.
The "Elastic Limit" in Metals.—Selection of wire for      suspension bridges, etc.
Prices of Metals in 1874 and 1884.—With table.
II. TECHNOLOGY.—A Method of Measuring the Absolute Sensitiveness      of Photographic Dry Plates.—By Wm. H. PICKERING.—From the      proceedings of the Academy of Arts and Sciences.
Soldering and Repairing Platinum Vessels in the      Laboratory.—By J.W. PRATT.
The Helicoidal or Wire Stone Saw invented by M.P. GAY.—With      engraving of quarry showing application of saw, and 5 figures.
Portable Prospecting Drill and Automatic Safety Gear shown at      the Inventions Exhibition.—With 2 engravings.
III.ELECTRICITY, ETC.—Electricity in Warfare.—By Lieutenant      B.A. FISKE, U.S.N.—Electrical torpedoes.—Torpedo      detecter.—Military telegraphy and telephony.—Electricity      for firing great guns.—Arrangement of wires for lights.—The      search light.—Incandescent lamps for sight      signaling.—Electrical launches.—An "electric sight".
Meucci's Claims to the Telephone.—With description of his      instrument and 10 figures.
An Electric Centrifugal Machine for Laboratories.—By ALEX.      WATT.—From paper read before the British Association.—1      figure.
Transmission of Power by Electricity.—Experiments of M.      MARCEL                        
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