I. CHEMISTRY AND METALLURGY.--The Determination of
Graphite in Minerals.--By J.B. MACKINTOSH.
Sulphocyanide of Potassium.
Sugar Nitro-glycerine.
On Remelting of Cast Iron.
The Hardness of Metals.
II. ENGINEERING, ETC.--The Jet Ventilator. 4 figures.
Feeding Boilers at the Bottom. 2 figures.
The Honigmann Fireless Engine.--The fireless working of steam
engines by means of a solution of hydrate of soda.--With
several figures and diagrams.
Simple Methods of Calculating Stress in Girders.--By CH. LEAN.--With
full page of illustrations.
A Spring Motor.
Steam Yachts.
III. TECHNOLOGY.--Foucault's Apparatus for Manufacturing
Illuminating Gas and Hydrogen. 2 figures.
The Circle Divider.
Soluble Glass.--Process of manufacture.--Use.
Iron Printing and Microscopic Photography.--Formulas for
printing solutions.--Compound negatives.
Practical Directions for Making Lantern Transparencies.--By
T.N. ARMSTRONG.
Casting Chilled Car Wheels. 6 figures.
IV. ELECTRICITY, ETC.--Electricity and Prestidigitation.
2 figures.
Portable Electric Safety Lamp. 6 figures.
The Electric Discharge and Spark Photographed Directly without
an Objective. 6 engravings.