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A New Type of Folding Bridge

An Official Geological Organization

Testing of Our Great Guns

The American Chemical Society

Condition of Workingmen in Michigan

A Device for Thawing Ice from Pipes

An Improved Car Coupling

An Improved Receiving Telephone

A Device for Cleaning Wood Saws

An Improvement in Flush Hinges

A Powerful Steam Crane


The Kenwood Physical Observatory

By George E. Hale

New Toboggan Slide for Bathers


  • Letters

    Correspondence- September 12, 1891

  • Departments

    Business and Personal- September 12, 1891

  • Notes and Queries- September 12, 1891

  • Recently Patented Inventions- September 12, 1891

  • To Inventors- September 12, 1891

  • Index of Inventions- September 12, 1891

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