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Features

Dr. Ernst Werner Siemens

Pneumatic Tubes for Mail Service

The Meteors of November, 1892

By Daniel Kirkwood

An Improved Breast Collar

An Improved Exhaust Nozzle

The Henrion Dynamo

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

  • Index of Inventions- December 17, 1892

  • Business and Personal- December 17, 1892

  • Notes and Queries- December 17, 1892

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December 17, 1892

Beyond XX and XY

Biology. Identity. Equality.

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