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The Electric Subways of the City of New York

Permeability of Cements, The Hastings Telescope, and more

An Improved Wire Stretcher

Improved Structure for Use as a Silo

Experiments in Magnetism

By Geo. M Hopkins

An Improved Binder

Improved Protector for Dikes or Levees

An Improved Book Support

An Improved Pocket Knife

An Improved Rocking Chair

An Improved Rope Clamp

Photographic Notes- April 20, 1889

Michel Eugene Chevreul

The Rev. J. G. Wood

To Inventors- April 20, 1889


  • New Books and Publications- April 20, 1889

  • Letters

    Correspondence- April 20, 1889

  • Departments

    Business and Personal- April 20, 1889

  • Recently Patented Inventions- April 20, 1889

  • Notes and Queries- April 20, 1889

  • Index of Inventions- April 20, 1889

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April 20, 1889

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