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Proposed New System of Waterworks for Chicago

A Glance Backward and Forward

Patents as Investments

Naval and Coast Defense

Vibration of Railway Bridges

Improved Shaft Coupling

Pig Iron Breaker

Experimental Boiler Explosion

Mechanical Inventions

Steam Boiler Notes

Engineering Inventions

New Worm and Worm Wheel and Gear Cutter

Dynamic Electricity

The Depolarization of Electrodes

By Geo. M. Hopkins

Miscellaneous Inventions

The Tape Worm

The Flying Squirrel

By R. W. Seiss


  • Departments


  • Recent Inventions

  • Business and Personal

  • Notes and Queries

  • Index of Inventions

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December 24, 1881

20% Sitewide for President's Day