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Progress of the Hudson River Tunnel

Electrical Paper

Perpetual Motion Delusions

Polarization of Sound

Opening of the New Workshop of the Stevens Institute of Technology

Telegraph Hand Car

New Belt Clasp

Engineering Inventions

New Spring Grass Shears

New Gang Boring Machine

New Method of Spacing and Lettering Signs

Mechanical Inventions

Feed Water Heater and Feed Pump

John Fitch's Steamboat Experiment on Collect Pond

Leech Farming

By A. W. Roberts

Communications Received


  • Departments


  • Recent Inventions

  • New Inventions

  • Notes and Queries

  • Business and Personal

  • Index of Inventions

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