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Improvements Needed in the New Navy

The Ammonia Motor

An Improved Freight Car Door

Improved Safety Devices for Elevators

An Improved Piano Action

Towing Canal Boats by Electricity

A Method of Tunneling

By Harold Avery

Vertical Cylinder Boring Machine

Improved Siphon Condenser

The World's Fair Franklin Statue

An Improved Weed Puller

An Improves Dumping Car

A Bow for Stringed Musical Instruments

To Inventors- January 23, 1892

Patents- January 23, 1892

Departments

  • Letters

    Correspondence- January 23, 1892

  • Recommended

    New Books and Publications- January 23, 1892

  • Departments

    Business and Personal- January 23, 1892

  • Notes and Queries- January 23, 1892

  • Recently Patented Inventions- January 23, 1892

  • Index of Inventions- January 23, 1892

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January 23, 1892

Complex Causes. Alternative Solutions.

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