Scientific American Magazine Vol 112 Issue 19

Scientific American Magazine

Volume 112, Issue 19

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Features

Hand Grenades, Strategic Positions of the Contending Armies and more

Edward C. Crossman

A Mother Ship for Submarines

A Combined Salvage and Drydock Vessel

Robert G. Skerrett

Plan for the Improvement of Hell Gate, East River, A Black Finish for Iron and more

C. D. Ward

Science and the Forger

Instruments and Illustrations in Questioned Document Cases

Albert S. Osborn

Milling the Soil

Improving on the Old-Fashioned Plow

L. W. Ellis

A System of Long Distance Typewriting

Eight Messages Sent Simultaneously Over a Single Wire

The Psychology of Batting in Baseball, Good Roads Legislation

Arthur Macdonald

Departments

Correspondence - May 8, 1915