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 DEPREZ.
IV. ART AND ARCHITECTURE.--Quadriga for the New House of
Parliament at Vienna.--An engraving.
Glazed Ware Finial.--With engraving.
Hotel de Ville, St. Quentin.--With engraving.
Fire Doors in Mills.--From a lecture before the Franklin
Institute by C.J. HEXAMER.