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Features

New Patent Selling Trick

Tunnel Railways in New York

The Artificial Production of Rain

Subscribers, Attention!

Opening of the New Pulitzer Building

Boomer & Boschert's Presses

An Improved Nut Lock

An Automatic Electrical Damper Regulator

An Adjustable Stuffing Box

A Machine to Sand Brick Moulds

Rail Rolling at the Krupp Works, Essen

An Easily Operated Belt Tightener

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

Departments

  • A Hot Water Ventilating Heater

  • Letters

    Correspondence- December 20, 1890

  • Departments

    Business and Personal- December 20, 1890

  • To Inventors- December 20, 1890

  • Recently Patented Inventions- December 20, 1890

  • Notes & Queries- December 20, 1890

  • Index of Inventions- December 20, 1890

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December 20, 1890