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The Pneumatic Dynamite Gun

The Fastest Steam Launch

Photographic Notes - July 10, 1886

Fruit Pulper

Adding Machine

Improved Pumping Apparatus

Operating Mechanism for Railway Signals

Boiler Sweeper

Automatic Grain Weighing and Registering Machine

Polarized Light

A Few Objects for the Polariscope

By Geo. M. Hopkins

The Minneapolis Industrial Exposition

The Meigs Elevated Railway

New York Harbor

The Hall Type Writer

Mennig's Steam Engine

Engineering Inventions - July 10, 1886

Miscellaneous Inventions - July 10, 1886


  • Departments

    Notes and Queries - July 10, 1886

  • Business and Personal - July 10, 1886

  • Index of Inventions - July 10, 1886

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Self-Awareness or Illusion?

Self-Awareness or Illusion?

Solving the “Hard Problem”