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Improved Horizontal Steam Engine, Potato Diggers

Artificial Jewelry

Annual Assay of the Coinage

By F. A. P. Barnard

How do you Prove Your Plumb Rule?

The "Luna" Moth

By E. C. H. Day

Combined Pruning Hook and Saw

Egg Tongs

Device for Cleaning Traps in Soil Pipes

What Becomes of all the Steel Pens?--Their Manufacture

The Working of the New York Fire Department

Improved Door Stop

Johnson's Improved Adjusting Plumb and Level

Improved Method of Attaching Knobs to Screws

Inspection of Steam Boilers in Ohio

Progress of the Darien Ship Canal

Practical Instruction in Mechanics and Physics

Caisson for the New York End of the East River Bridge

Whiskey, New and Old

The Moral Lubricator

Scientific Education and Religion

Dangerous Dentistry

Endless Platform Belt Railway for New York

Scientific Intelligence- April 1, 1871

Queries- April 1, 1871

Preservation of Wood under Water

Obituary Notices

Answers to Correspondents- April 1, 1871

Applications for Extension of Patents- April 1, 1871

Official List of Patents- April 1, 1871

Issued by the U. S. Patent Office

Recent American and Foreign Patents- April 1, 1871


  • Letters

    Correspondence- April 1, 1871

  • Departments

    Business and Personal- April 1, 1871

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April 01, 1871

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