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The Westinghouse Interlocking Switch and Signal System

A Questionable Patent Bill

The Oil Well at Southbury, Conn

By E. O. Hovey

An Improved Automatic Dumb Waiter

An Improved Brace for Piano String Frames

An Improved Water Tower and Extension Ladder

An Improved Time Register

New German Armor-Clad Cruisers

An Improved Windlass

An Improved Shaft Lighter

An Improved Animal Bed

Preserve for Binding

The Wilzin Automatic Knife

An Improved Hay Sling

The Proposed Suspension Bridge across the Hudson River at New York

An Improved Grinding Machine

Automatic Time and Dating Stamps

An Improved Steam Engine Valve

Scientific American Building Edition- May 3, 1890

To Inventors- May 3, 1890

The Scientific American Established 1846


  • Recommended

    New Books and Publications- May 3, 1890

  • Departments

    Notes and Queries- May 3, 1890

  • Business and Personal- May 3, 1890

  • Recently Patented Inventions- May 3, 1890

  • Index of Inventions- May 3, 1890

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