Volume 70, Issue 1802supp
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Features
Synthetic Rubber
The Crystalline Structure of Iron at High Temperatures
The India-Rubber Industry.—II
Past, Present, and Future
The Place De L'Opera Station
A Complex Engineering Feat on the Paris Metropolitan
Reversing Motors
Some Much-Needed Data
The Electrification of Railways.—II
An Imperative: Need for the Selection of a System for Universal Use
Turbines and Propellers
Rays of Positive Electricity
Useful Shipyard Machine
Universal Shear for Channels, Angles, and Plates
A New System of Wireless Telegraphy
The Belli Nl-Tosi Apparatus
The Light of the Firefly
Luminosity Without Heat
Mining Coal with Explosives
Suggestions for the Miner
Numbering the Stars
The Astrographic Chart and Catalogue