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The Ottawa River Dam

Does Good Work Pay?

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

Making a Drill Chuck

The Great Bridge Almost Completed

An Artificial Aurora Borealis

Aspects of the Planets for May

Seals in Long Island Sound

By H. C. Hovey

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

Mechanical Inventions

Engineering Inventions

Miscellaneous Inventions

Agricultural Inventions

Communications Received


  • Departments

    Recent Inventions

  • New Books and Publications

  • Business and Personal

  • Notes and Queries

  • Index of Inventions

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