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The Division of Labor

The Electric Light in Akron, Ohio

The Study of Animal Motions

Standard Time in the United States

More about Pickett's Cave

By H. C. Hovey

Mechanical Inventions

Improved Force Pump

Improved Water Meter

American Industries.--No. 72

Hanger for Shafting

Miscellaneous Inventions

Hulling Cotton Seed

The Stag Beetle and Champion Beetle

The Colors of the Stars

Richly Decorated Vase

Communications Received


  • Departments

    Recent Inventions

  • Correspondence

  • Notes and Queries

  • Business and Personal

  • Index of Inventions

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