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The New London Double Track Railroad Bridge and Draw Span

An Expected Revolution in Steam Navigation

An Improved Sash Fastener

An Improved Steam-Actuated Valve

An Improved Vegetable Cutter

An Improved Guide for Band-Saws

An Improved Pinch Bar

Jerboas, Marmots, and Lemmings in the Zoological Garden of Berlin

An Improved Folding Step-Ladder

An Improved Air Ship

A Siren for Measuring Velocities

By Geo. M. Hopkins

A Scientific Will-O'-the-Wisp

By T. O'conor Sloane


  • Departments

    Notes and Queries- June 8, 1889

  • Recently Patented Intentions- June 8, 1889

  • Business and Personal- June 8, 1889

  • To Inventors- June 8, 1889

  • Index of Inventions- June 8, 1889

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