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Features

Improved Rail Car Brake

Notes on Military and Naval Affairs

Our Special Correspondence

Ordnance in the London Exhibition

Manufacture of Large Guns

Business in General

The London Exhibition Management

The Time is Up

New Enterprise--Steam Wagon for the Western Prairies

Incrustation of Steam Boilers

Recent American Inventions - June 21, 1862

Notes on Foreign Inventions and Discoveries - June 21, 1862

Patent Claims - June 21, 1862

To Our Readers

Departments

  • Letters

    Correspondence - June 21, 1862

  • Departments

    Notes and Queries - June 21, 1862

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June 21, 1862

Confronting Common Wisdom