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Scientific American Magazine Vol 60 Issue 23

Scientific American Magazine

Volume 60, Issue 23

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Features

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

Geo. M. Hopkins

A Scientific Will-O'-the-Wisp

T. O'conor Sloane

Departments

Business and Personal- June 8, 1889

Recently Patented Intentions- June 8, 1889

Notes and Queries- June 8, 1889

Index of Inventions- June 8, 1889

To Inventors- June 8, 1889