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The Photo-Mechanical Processes

By S. R. Koehler

Vanloo's Portrait of Christopher Columbus

Burned Clay

By L. J. Howard

Improved Oil Cloth Printing Machine


The Huanchaca Mine, Bolivia, South America

By Robert Peele

Temperature Regulator for Incubators

An Ocean Waif

The Vulcanizing Process for Preserving and Strengthening Poles, Cross Arms, Ties, Etc.

By Harry C. Myers

The New German Field Artillery

Japanese Magic Mirrors

The Tesla Lecture in St. Louis

Siemens Telephone Siren

On the Treatment of Diabetes

Electric Oscillations

The Lunar Surface

A Patent Toy

The Sandgate Landslip

The Chatham Islands and an Antarctic Continent

Recent Contributions to the Chemistry and Bacteriology of the Fermentation Industries

By Percy F. Frankland

Horticultural Novelties of the Season

Blanket with Weights

Chemistry of the Stomach


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    April 15, 1893

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