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Features

Petroleum, the Great Illuminant

The Prentiss Calendar and Time System

A Watchmaker's Staking Pliers

An Automatic Time Dater

An Improved Car Fender and Brake

Improved Knitting Machinery

An Improved Car Brake

The Nafew-Lovell Check Protector

The West Side Metropolitan Elevated Railway System of Chicago

Some Interesting Animals

James D. Dana

Departments

  • Letters

    Correspondence - April 27, 1895

  • Recommended

    New Books and Publications - April 27, 1895

  • Departments

    Recently Patented Inventions - April 27, 1895

  • Business and Personal - April 27, 1895

  • Notes and Queries - April 27, 1895

  • Index of Inventions - April 27, 1895

  • Patents - April 27, 1895

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Bacterial Balancing Act

Bacterial Balancing Act

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