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    Features

    Pneumatic Tubes for Mail Service

    The Meteors of November, 1892

    By Daniel Kirkwood

    Dr. Ernst Werner Siemens

    An Improved Exhaust Nozzle

    The Henrion Dynamo

    An Improved Breast Collar

    Rod and Ring Experiment

    By Geo. M. Hopkins

    Some of the "Cholera Streets" in Hamburg

    By Annesley Kenealy

    The Hygienic Treadmill

    Improved Recording Pressure Gauge

    Metropolitan Sewerage System Surrounding Boston

    By B. G Underwood

    Departments

    • Letters

      Correspondence- December 17, 1892

    • Recommended

      New Books and Publications- December 17, 1892

    • Departments

      Recently Patented Inventions- December 17, 1892

    • To Inventors- December 17, 1892

    • Business and Personal- December 17, 1892

    • Index of Inventions- December 17, 1892

    • Notes and Queries- December 17, 1892

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    December 17, 1892

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