II. ENGINEERING AND MECHANICS.--The Ethics of Engineering
Practice.--An address by Mr. JAS. C. BAYLES, before the American
Institute of Mining Engineers.
Lifting a 40-inch Water Main.--With engraving.
The Inter-oceanic Canal Question.
The Mersey Tunnel.
Improved Revolver.--With 4 figures.
Motors for Street Railways.--Results of experiments on mechanical
motors for tramways made by the jury on railway appliances
at the Antwerp Exhibition.--By Capt. DOUGLAS GALTON.
III. TECHNOLOGY.--Alizarine Dyes.--Process of dyeing.--Recipes for
various colors.
Cement Paving.--Composition made by the Wilkes' Metallic
Flooring Company.--Other compositions.
A New Bleaching Process.--The "Mather-Thompson" system.
Instruments for Drawing Curves.--By Prof. C.W. MACCORD--1.
The Hyperbola--2 figures.
Experiments with Fibers.--By Dr. THOS. TAYLOR.--Detection of
Fraud.--Method employed.--Cotton mixed with linen.--Experiments
with flax.--Wool tested with acid.--Tests of dyed black silk.
Orthochromatic Plates.--By CH. SCOLIK.
A New Photographic Apparatus.--With engraving.
IV. ELECTRICITY, PHYSICS, ETC.--On the Theory of the
Electro-magnetic Telephone Transmitter.--By E. MERCADIER.
On the Theory of the Receiver of the Electro-magnetic
Telephone.--By E. MERCADIER.
Frew's Improved Pyrometer.--With engraving.
Dew.--Abstract of a paper read before the Royal Society of
Edinburgh.--By Mr. AITKEN.--Source of dew.--Observations of the
temperature of the ground.--Experiments.--Effects of
wind.--Excretion of drops of liquid by plants.--Radiating power of
different surfaces at night.