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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

Device for Cleaning Traps in Soil Pipes

Egg Tongs

Combined Pruning Hook and Saw

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

The Working of the New York Fire Department

Improved Method of Attaching Knobs to Screws

Johnson's Improved Adjusting Plumb and Level

Improved Door Stop

Practical Instruction in Mechanics and Physics

Inspection of Steam Boilers in Ohio

Progress of the Darien Ship Canal

Dangerous Dentistry

The Moral Lubricator

Caisson for the New York End of the East River Bridge

Scientific Education and Religion

Whiskey, New and Old

Scientific Intelligence- April 1, 1871

Preservation of Wood under Water

Endless Platform Belt Railway for New York

Queries- April 1, 1871

Obituary Notices

Applications for Extension of Patents- April 1, 1871

Answers to Correspondents- April 1, 1871

Recent American and Foreign Patents- April 1, 1871

Official List of Patents- April 1, 1871

Issued by the U. S. Patent Office


  • Letters

    Correspondence- April 1, 1871

  • Departments

    Business and Personal- April 1, 1871

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