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The Otto Gas Engines at the Columbian Exposition

Amateur Naval Operations

Notes from the Worlds Columbian Exposition Chicago 1893

The “Paragon” Speed Indicator

Boring Machine for Corliss Engine Cylinders

Mechanical Arithmetic

By Dorr E. Felt

An Improved Electric Motor Truck

A Heater and Condenser

Optical Goods at the Exposition

Russian Exhibits

Improved Construction of Floors, Ceilings, Arches, Etc

Western Electric Company's Luminous Sign

A Geometrical Educational Appliance

American Historical Exposition in Madrid

To Inventors


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  • Recently Patented Inventions

  • Index of Inventions

  • Notes and Queries

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November 11, 1893

Confronting Common Wisdom