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Report of the Experiments with the Turbine Water Wheels at Philadelphia

Romance of the Steam Engine

Column of Varieties

The Armstrong Gun a Failure

The Commissioner of Patents—New Examiners

Can the Rifling of Guns be Dispensed With

Our Secession Troubles

Wealth—A Review of the Subject

The Polytechnic Association of the American Institute

Patent Claims - April 13, 1861

Issued from the United States Patent Office


Hale's Mode of Impelling Shot and Shell


  • Letters

    Correspondence - April 13, 1861

  • Departments

    Notes and Queries - April 13, 1861

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