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Features

Improved Method of Propelling Canal boats

The Remington Works Ilion, NY

Diamond Cutting in New York

Fastenings for Neck Ties, Scarfs, Etc.

Measuring the Velocity of Rotation

The Baltimore Boiler Inspection Law

The Discovery and History of the Chromosphere

By J. H. Leach

Inextinguishable Signal Light

Heard's Ventilating Hat

Combined Cast Iron and Wrought Iron Arch Girders

Frictional Gearing - April 13, 1872

By E. S. Wicklin

Scientific and Practical Information - April 13, 1872

Umbrella Frames

Proposed City Railroad

Death Of Samuel F. B. Morse

The Great Sewing Machine Job before Congress

Sewing Machines and their Effect Upon Health

A Trades Union Tirade

Lightning Rods

Spiritualism Answered by Science

Recent American and Foreign Patents - April 13, 1872

Departments

  • From the Editor

    Answers to Correspondents - April 13, 1872

  • Recommended

    New Books and Publications - April 13, 1872

  • Departments

    Business and Personal - April 13, 1872

  • Notes and Queries - April 13, 1872

  • Index of Inventions - April 13, 1872

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