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Krupp's 1,000-Pounder Siege Gun, Great Circle "Travel"

Shortt's Self-Centering Sleeve Coupling

Bronze vs. Steel and Iron for Field Artillery

The Dissipation of Energy

On the Application of the Hot Blast to Blow-Pipe Purposes

By W. Skey

The Bridge de L'aisne on the Railway from Soissons to Laon, in France

Important Patent Office Decisions

Bussell's Disk Cultivator and Harrow

The Use of Balloons in Warfare

New Relations of Silica

History and Progress of Photography

Resources of the South--Notes of a Trip from New York to Western Texas

Fair of the American Institute- October 1, 1870

New Mechanical Movements- October 1, 1870

Scientific Intelligence- October 1, 1870

Answers to Correspondents- October 1, 1870

Recent American and Foreign Patents- October 1, 1870

Official List of Patents- October 1, 1870


  • Letters

    Correspondence- October 1, 1870

  • Recommended

    New Books and Publications- October 1, 1870

  • Departments

    Business and Personal- October 1, 1870

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