Skip to main content


The Electric Subways of the City of New York

Permeability of Cements, The Hastings Telescope, and more

Experiments in Magnetism

By Geo. M Hopkins

Improved Structure for Use as a Silo

An Improved Wire Stretcher

An Improved Pocket Knife

An Improved Rocking Chair

Improved Protector for Dikes or Levees

An Improved Rope Clamp

An Improved Binder

An Improved Book Support

Photographic Notes- April 20, 1889

Michel Eugene Chevreul

The Rev. J. G. Wood

To Inventors- April 20, 1889


  • Letters

    Correspondence- April 20, 1889

  • Recommended

    New Books and Publications- April 20, 1889

  • Departments

    Recently Patented Inventions- April 20, 1889

  • Business and Personal- April 20, 1889

  • Notes and Queries- April 20, 1889

  • Index of Inventions- April 20, 1889

Purchase To Read More

Already purchased this issue? Sign In to Access
Select Format
April 20, 1889

Of Shamrocks and Science

Happy St. Patrick’s Day