I. CHEMISTRY.--Tin in Canned Foods.--By Prof. ATTFIELU.--Small
amount of tin found.--Whence come these small particles.--No
cause for alarm.
II. ENGINEERING AND MECHANICS.--The Windmill.--By JAMES
W. HILL.--The Eclipse wind.--Other wind mills.--Their operation,
use, etc.
The Pneumatic Dynamite Gun.--With engraving of pneumatic
dynamite gun torpedo vessel.
Rope Pulley Friction Brake.--3 figures.
Wire Rope Towage.--Treating of the system of towage by hauling
in a submerged wire rope as used on the River Rhine, boats
employed, etc.--With engraving of wire rope tug boat.
Improved Hay Rope Machine.--With engraving.
The Anglesea Bridge, Cork.--With engraving.
Portable Railways.--By M DECAUVILLE.--Narrow gauge roads
in Great Britain.--M. Decauvilie's system.--Railways used at the
Panama Canal, in Tunis, etc.
III. TECHNOLOGY.--Improved Pneumatic Filtering Presses, and the
Processes in which they are employed.--2 engravings.
Pneumatic Malting.
A New Form of Gas Washer.--Manner in which it is used.--By
A. BANDSEPT.--2 figures.
IV. ELECTRICITY, HEAT, ETC.--Gerard's Alternating Current
Machine.--2 engravings.
Automatic Fast Speed Telegraphy.--By THEO. F. TAYLOR.--Speed
determined by resistance and static capacity.--Experiments
Taylor's system.--With diagram.
Theory of the Action of the Carbon Microphone.--What is it?
--2 figures.
The Dembinski Telephone Transmitter.--3 figures.
New Gas Lighters.--Electric lighters.--3 engravings.
Distribution of Heat which is developed by Forging.