Features
Double Bow Girder Bridges
Novel Life Boat
On the Hardening, Tempering, and Annealing of Steel
Telescopic Rudder
A New Metallic Compound
Gilding Metal Surfaces
Dynamo-Electric Machines
The Chemistry of Light
Improved Insulator
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
A Masterpiece of Modern Industrial Art
The Future of China
To the Editor of the Scientific American :
