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Subscribers, Attention!

New Patent Selling Trick

The Artificial Production of Rain

Opening of the New Pulitzer Building

Tunnel Railways in New York

An Improved Nut Lock

An Adjustable Stuffing Box

Boomer & Boschert's Presses

An Automatic Electrical Damper Regulator

A Hot Water Ventilating Heater

An Easily Operated Belt Tightener

Rail Rolling at the Krupp Works, Essen

A Machine to Sand Brick Moulds

An Improved Article for Plastering, Tiling, and Cement Work

An Improved Lumber Drier

Mr. Brush's Windmill Dynamo

A Pine Apple Grove in Florida

New Marine Signal

To the North Pole in a Balloon

The "Crystal" Water Filter

The Scientific American- December 20, 1890


  • Letters

    Correspondence- December 20, 1890

  • Departments

    Business and Personal- December 20, 1890

  • Notes & Queries- December 20, 1890

  • To Inventors- December 20, 1890

  • Index of Inventions- December 20, 1890

  • Recently Patented Inventions- December 20, 1890

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