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Scientific American Magazine Vol 113 Issue 20

Scientific American Magazine

Volume 113, Issue 20

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Features

Twin-Six Engines for Aeroplanes, Missing! and more

Frederick Eppelsheimer

Malarial Mosquitoes as the Food of Bats

Experiments and Observations Indicating That the Bat Is the Arch Enemy of the Malarial Mosquito

Chas. H. R. Campbell

Strategic Moves of the War, November 4th, 1915

J. B. W. Gardiner

The Dyestuff Famine.—II

The Promise for the Future

Thomas H. Norton

Microscopic Study of the Phonograph

Discussion of the Mechanical Features of Record Grooves and Styluses

J. B. Taylor

Science as an Aid to Practical Tennis, Observation Mines for Harbor Protection

Dwight Douglass

Departments

Inventions New and Interesting - November 13, 1915

Recently Patented Inventions - November 13, 1915

Notes and Queries - November 13, 1915