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The Ottawa River Dam

Does Good Work Pay?

The Great Bridge Almost Completed

Relative Costs of Street Lighting by Electricity and Gas in New York

Making a Drill Chuck

An Artificial Aurora Borealis

Seals in Long Island Sound

By H. C. Hovey

Aspects of the Planets for May

Bulkheads for Steamships

Piefke's Filter

The Hudson River Tunnel

Mice-Girdled Trees

Automatic Four-Roller Mill

Improvement in Tunnel and House Building

Manufacture of Charcoal

Physics Without Apparatus

Agricultural Inventions

Miscellaneous Inventions

Mechanical Inventions

Engineering Inventions

Communications Received


  • Departments

    Recent Inventions

  • Business and Personal

  • Notes and Queries

  • New Books and Publications

  • Index of Inventions

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April 28, 1883