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Twin-Six Engines for Aeroplanes, Missing! and more

By Frederick Eppelsheimer

Malarial Mosquitoes as the Food of Bats

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

By Chas. H. R. Campbell

Strategic Moves of the War, November 4th, 1915

By J. B. W. Gardiner

The Dyestuff Famine.—II

The Promise for the Future

By Thomas H. Norton

Microscopic Study of the Phonograph

Discussion of the Mechanical Features of Record Grooves and Styluses

By J. B. Taylor

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

By Dwight Douglass


  • Departments

    Inventions New and Interesting - November 13, 1915

  • Recently Patented Inventions - November 13, 1915

  • Notes and Queries - November 13, 1915

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