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Progress of the Hudson River Tunnel

Electrical Paper

Polarization of Sound

Perpetual Motion Delusions

Opening of the New Workshop of the Stevens Institute of Technology

New Belt Clasp

Telegraph Hand Car

Engineering Inventions

New Gang Boring Machine

New Spring Grass Shears

Feed Water Heater and Feed Pump

New Method of Spacing and Lettering Signs

Mechanical Inventions

John Fitch's Steamboat Experiment on Collect Pond

Leech Farming

By A. W. Roberts

Communications Received


  • Departments


  • Recent Inventions

  • New Inventions

  • Business and Personal

  • Notes and Queries

  • Index of Inventions

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June 04, 1881

The Antidote to Anti-Intellectualism