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Transmission of Messages through the Air by Electricity without Wires

By John Trowbridge

Electric Motive Power on Elevated Railways

By William Nelson Smith

Wire Ropeways, with Notes on the Plomosas Line

By B. McIntire

Oscillating Hot Saw

Purdy's Armored Twin War Vessel

A Multiple Portrait


By Thomas Bolas


Automatic Apparatus for the Manufacture of Carbonated Waters

An Astronomer's Imaginary Visit to Venus

Photographic Equatorial Telescope

Galls on Lime

The White Oak

Culture of Fruit Trees under Glass

Building Plans and Specifications

Action of Hydrogen Gas on Pig, Steel, and Iron

Useful Engineering Books


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February 21, 1891

Science for the Modern World