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Features

Liquid Crystals and Theories of Life

Our Berlin correspondent

Berthelot

By F. Ashford White

The New Inland Sea

The Retreating cataract

By Arthur P. Davis

The Permanence of Continents

The Cruiser of the Future

Estimates of Population, 1904, 1905, 1906

Roentgen, Cathode, and Positive Rays

The Making of a Half-Tone engraving

The Chemical Composition of Tool Steel

The more important characteristics of high speed tools

The Making of small Induction Coils with Bare Wire

By A. Frederick Collins

Pumping Devices for Open Tank Service

By W. H. Wakeman

Halley's Comet

By F. W. Henkel

Electrical Notes

Science Notes

Engineering Notes

Departments

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    April 13, 1907

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