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Features

The Metropolitan Telephone Co.'s New Central Station and Great Switchboard

Wanted-a First Class Gun

Position of the Planets in April 1889

War Material of American Designing

An Improved Brake Block

An Improved Buckboard

Improved Handle for Sliding Doors

An Improved Knife Cleaner

A Novel Nut Lock

An Improved Rotary Harrow

Improved Device for Detaching Animals

An Insulator for Electrical Conductors

Improved Hood for Stoves or Ranges

An Improved Plant Nest

Armstrong's Envelope Cutter

An Improved Photograph Printing Frame

Improved Calipers and Dividers

An Improved Watering Trough

The New Spanish Ship of War Pelayo

Photographic Notes- March 30, 1889

Departments

  • From the Editor

    To Inventors- March 30, 1889

  • Letters

    Correspondence - March 30, 1889

  • Departments

    Recently Patented Inventions- March 30, 1889

  • Business and Personal- March 30, 1889

  • Notes and Queries- March 30, 1889

  • Index of Inventions- March 30, 1889

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March 30, 1889

Beyond XX and XY

Biology. Identity. Equality.