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Speed in Our New Navy

The Illinois State Building at the World's Fair

The Patent Centennial Celebration-April 8, 9, And 10

A Hanger for Picture or Mirror Frames

How Stocks of Pig Iron are Held

Improved Cloth Pressing Machine

A Card-Board Making Machine

The Darragh Water Filter

Scientific American Building Edition—April 18, 1891

To Inventors- April 18, 1891

List of Books on Electricity—April 18, 1891


  • Letters

    Correspondence- April 18, 1891

  • Recommended

    New Books and Publications- April 18, 1891

  • Departments

    Business and Personal- April 18, 1891

  • Recently Patented Inventions- April 18, 1891

  • Index of Inventions- April 18, 1891

  • Notes and Queries- April 18, 1891

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Bacterial Balancing Act

Bacterial Balancing Act

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