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Pennsylvania Board of Health Notes

Novel Torpedo Boat Designing and Maneuvering

An Improved Washing Machine

A Mechanical Movement

Barton's Improved Fence

An Improved Annealing Box

Gerstle's Hinged Handle for Pans, Etc

An Improved Magnetic Ore Separator

Eberhardt's Universal Automatic Gear Cutting Machine

The New U. S. Cruiser Baltimore

By F. T. Drake

An Improved Globe Holder

Maria Mitchell

Improved Bar Channeling Stone Drill

A Nest-Building Frog

By Nicolas Pike


  • Recommended

    New Books and Publications- July 20, 1889

  • Departments

    Recently Patented Inventions- July 20, 1889

  • Index of Inventions- July 20, 1889

  • Business and Personal- July 20, 1889

  • To Inventors- July 20, 1889

  • Notes and Queries- July 20, 1889

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July 20, 1889

Science for the Modern World