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Photographs by Cable, North Sea Net--A Civil Engineer's Job, and more

Automobile- August 4, 1917

Electricity- August 4, 1917

Science- August 4, 1917

The Submarine Problem--X

The Gun as an Answer to the Submarine

Mechanics and Mathematics of the Draft

Outstanding Features of the Process through which 687, 000 Young Americans Will Be Called to the Colors

By C. H. Claudy

The Earthquakes and Eruptions in San Salvador

Seismic Disturbances in Central American Republic from June 7th to July 4th

By Herbert J. Spinden

When the Gasoline Cavalry Charges

With the French Tanks During a Typical Battle.

Specialization as an Aid to War-Time Industry in England

Use of X-Rays for Examining Reinforced Concrete, Utilization of Waters of Lowlands in Fisheries

A Ship with No Reciprocating Machinery, A Neutral Zone in the Campaign Against an Insect Pest, and more


  • Letters

    Correspondence- August 4, 1917

  • Recommended

    New Books, Etc.- August 4, 1917

  • Departments

    The Heavens in August

  • Inventions New and Interesting- August 4, 1917

  • Recently Patented Inventions- August 4, 1917

  • Notes and Queries- August 4, 1917

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