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The Division of Labor

The Study of Animal Motions

The Electric Light in Akron, Ohio

More about Pickett's Cave

By H. C. Hovey

Standard Time in the United States

Improved Force Pump

Mechanical Inventions

Improved Water Meter

American Industries.--No. 72

Hanger for Shafting

Hulling Cotton Seed

Miscellaneous Inventions

The Stag Beetle and Champion Beetle

Richly Decorated Vase

The Colors of the Stars

Communications Received


  • Departments

    Recent Inventions

  • Correspondence

  • Business and Personal

  • Notes and Queries

  • Index of Inventions

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April 30, 1881

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