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The Otto Gas Engines at the Columbian Exposition

Amateur Naval Operations

Notes from the Worlds Columbian Exposition Chicago 1893

Boring Machine for Corliss Engine Cylinders

The “Paragon” Speed Indicator

An Improved Electric Motor Truck

Mechanical Arithmetic

By Dorr E. Felt

A Heater and Condenser

Optical Goods at the Exposition

Russian Exhibits

Improved Construction of Floors, Ceilings, Arches, Etc

Western Electric Company's Luminous Sign

American Historical Exposition in Madrid

A Geometrical Educational Appliance

To Inventors


  • Departments


  • Recently Patented Inventions

  • New Books and Publications

  • Index of Inventions

  • Business and Personal

  • Notes and Queries

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