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Experiments with the Sims-Edison Torpedo

It Pays to Advertise in the Scientific American

The Gypsy Moth in Massachusetts

An Improved Screen Attachment for Windows

An Improved Surveyor's Instrument

An Improved Umbrella or Parasol Exhibitor

Bolt Threading Machine

An Improved Folding Table

A Hand Rest for Penmen

An Improved Adjustable Axle Nut

An Improved Blasting Car

An Improved Block and Clevis for Log Wagons

The Chicago

Redwood Logging In California

A Wrinkle in Sawing

The Scientific Use of the Phonograph

By Geo. M. Hopkins


  • Letters

    Correspondence- July 26, 1890

  • Recommended

    New Books and Publications- July 26, 1890

  • Departments

    Recently Patented Inventions- July 26, 1890

  • Business and Personal- July 26, 1890

  • Notes and Queries- July 26, 1890

  • Index of Inventions- July 26, 1890

  • To Inventors- July 26, 1890

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