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Features

Edison Dynamo and Motor

The Edison Electric Lamp Patent Sustained

Salt Packing--A $4,000 Prize Contest

Photographic Notes- July 25, 1891

An Improved Mortising Machine

Improved Mechanical Mixer

Supplying Moving Trains With Water

A Weight Power to Drive Fans, etc.

Some Measurements in the Mammoth Cave of Indiana

By H. C. Hovey

Edward Burgess and his Achievements

Locust Visitations

Departments

  • Letters

    Correspondence- July 25, 1891

  • Recommended

    New Books and Publications- July 25, 1891

  • Departments

    Notes and Queries- July 25, 1891

  • Business and Personal- July 25, 1891

  • Recently Patented Inventions- July 25, 1891

  • To Inventors- July 25, 1891

  • Index of Inventions- July 25, 1891

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Dwindling Supply. Increasing Demand.

Dwindling Supply. Increasing Demand.

Solving the Water Crisis