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The Yerkes Observatory

The New Commissioner of Patents

Amendments to the Copyright Law

Relation of the Government to the Patents of Naval Officers

A Bill to Protect Inventors

A New Discovery in Physics

Usefulness of the Simplon Tunnel

Gems of Quartz Origin

Automatic Slack Adjuster for Car Brakes

An Efficient Woodworking Machine

An Improved Die Head

Ney's Pocket Field Glass

The United States First-Class Sea-Going Battleship Iowa

A Toy Phonograph

Chilton's Safety Pin

The Field Columbian Museum, Chicago

A Velocipede Shower Bath


  • Letters

    Correspondence - April 10, 1897

  • Departments

    New Books, Etc - April 10, 1897

  • Business and Personal - April 10, 1897

  • Notes and Queries - April 10, 1897

  • Recently Patented Inventions - April 10, 1897

  • Index of Inventions - April 10, 1897

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