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Features

Flotation for the Practical Mill Man

A Description of Several Important Factors in Concentration by Flotation

By Frederick G. Moses

“Cupping” vs. “Boxing”

Advances in the Turpentine Industry in the Southern States

By Chas. H. Herty

Acquired Radioactivity

By William Crookes

Recent Developments in Marine Lighting—III

Methods of Sound Signalling

The Strongest and Most Durable Fiber

The Cultivation, Preparation, Spinning, Weaving and History of Flax

By W. Norman Boase

New Method in Photogrammetry

An Accurate and Convenient Method for Photographic Surveying with any Camera

By Robert Heindl

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    July 19, 1919

    Think Outside the Gift Box