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Features

The Caisson for the East Pier of the St. Louis Bridge

The Patent Laws

The Ivory Plant

Triangular Suspension Bridge

Boring for Oil

Improved Power Hoisting Machine

Instruments used in Storm Signal Service

Furrowing Hammer for Stone Dressing

Firing of Steam Boilers

Pisciculture in New York and New Jersey

Iron Rails for Common Roadways

Artificial Stone

The Battle of the Tires

Suggestions for the Improvement of Railways

Employment of Females in New York

Queries- April 15, 1871

Scientific Intelligence- April 15, 1871

Answers to Correspondents- April 15, 1871

Recent American and Foreign Patents- April 15, 1871

Official List of Patents- April 15, 1871

Issued by the U. S. Patent Office

Applications for Extension of Patents- April 15, 1871

Departments

  • Letters

    Correspondence- April 15, 1871

  • Recommended

    New Books and Publications- April 15, 1871

  • Departments

    Business and Personal- April 15, 1871

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April 15, 1871