Volume 9, Issue 222supp
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Features
Brown's Tramway Locomotives
Telescopic Rudder
On the Hardening, Tempering, and Annealing of Steel
Novel Life Boat
A New Metallic Compound
Gilding Metal Surfaces
Dynamo-Electric Machines
Improved Insulator
The Chemistry of Light
Photographing by Gaslight
Lines of Discovery in the History of Ozone
I.—Its Original Discovery, Sources, and Properties
Cobalt and Nickel—their Distinction in Mixed Solution
The Practical Determination of the Value of the Sugars of Commerce
The Chemistry of Bread Making
The Future of China
To the Editor of the Scientific American :