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Features

The Saxby and Farmer Safety Switches and Signals

Syrian Sponges

Science in Common Schooling

Michigan's Salt Interests

The Mission of the Fly

Inspection of Boilers

The Hudson River Tunnel at New York

Scientific and Practical Information - April 3, 1875

Improved Water Injectors

Red Deer

Recent American and Foreign Patents - April 3, 1875

Communications Received - April 3, 1875

Canadian Patents - April 3, 1875

Departments

  • Letters

    Correspondence - April 3, 1875

  • Departments

    Notes and Queries - April 3, 1875

  • Business and Personal - April 3, 1875

  • Index of Inventions - April 3, 1875

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