Torpedo Ships.

The Gas Engine.--By DUGALD CLERK.--Combustion engines.--First
cylinder and piston engine.--Watt's experiments.--First gas
engine.--Principles of the gas engine.

Rapid Construction of the Canadian Pacific Railway.--By E.T.
ABBOTT.

The Osgood Mammoth Excavator.--3 figures.

Capstan Navigation on the Volga.--4 figures.

Steamboat Equipment of War Vessels.--With engraving of winch
for raising and lowering torpedo boats.

Improved Steam Trap.--1 engraving.


II. TECHNOLOGY.--Critical Methods of Detecting Errors in Plane
Surfaces.--By JOHN A. BRASHEAR.--11 figures.

Photometric Standards.--9 figures.

Bleaching or Dyeing Yarns and Goods in Vacuo.--1 figure.

On the Moulding of Porcelain.--By CHAS. LAUTH.--Moulding by
pressure of the air.--Moulding by vacuum.--Drying the moulded
pieces.--2 figures.