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Features

Pigeons as Dispatch Carriers

Progress of Aluminum

Big Guns for Coast Defense

A Mountain Railway Near New York City

A Refrigerator Vehicle for Perishable Articles

An Automatic Steam Boiler Feeder

A Brake for Street Cars

An Improved Elevator Gate

A Cork-Drawing Device

An Improved Wrench

A Marker for Wood-Workers

The Defense of New York

Cure of Consumption--An Interview with Professor Koch

By Charles Hacks

Safe Construction of Buildings

Electric Chimes

Departments

  • Letters

    Correspondence- December 6, 1890

  • Recommended

    New Books and Publications- December 6, 1890

  • Departments

    Business and Personal- December 6, 1890

  • Notes & Queries- December 6, 1890

  • Recently Patented Inventions- December 6, 1890

  • To Inventors- December 6, 1890

  • Index of Inventions- December 6, 1890

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December 06, 1890

Beyond XX and XY

Biology. Identity. Equality.

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