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Improvement in Heavy Ordnance, Conducting Wires for Military Telegraphs

The Condensed Milk Manufacture

Dyers' Recipes- March 25, 1871

The Flight of Birds

By R. O. Davidson

Archibald's Improved Spoked Wheel

Spring Steps for Stairways

Improvement in Envelopes

Rating of Boilers

Thallium, Its Properties and Uses

Railway Transit for New York

The Human Mind and the Human Hand

The Use of the Microscope in the Study of Rocks

Cost of Water in New York City

On the Nature and Manufacture of Charcoal

Wood Carpeting

Recent Patent Decision- March 25, 1871

Answers to Correspondents- March 25, 1871

Queries- March 25, 1871

Recent American and Foreign Patents- March 25, 1871

Official List of Patents- March 25, 1871

Issued by the U. S. Patent Office

Applications for Extension of Patents- March 25, 1871


  • Letters

    Correspondence- March 25, 1871

  • Recommended

    New Books and Publications- March 25, 1871

  • Departments

    Business and Personal- March 25, 1871

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