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Features

The Progress of Elevated Railways

A Zoological Garden for New York

The American Institute Fair

The Origin of Machine-Made Pens

Metallic Fences

New Torpedo Experiments by Capt. Ericsson

Mechanical Inventions

Shearing and Riveting Machinery

Agricultural Inventions

A Novel Candle

New Amalgamator

Engineering Inventions

New Hydraulic Ram

An Improvement in Stovepipes

Palissy Plate

Miscellaneous Inventions

Electric Jewelry

Baptismal Font

Communications Received

Departments

  • Departments

    Notes and Queries

  • Business and Personal

  • Index of Inventions

  • Patents

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October 25, 1879

Beyond XX and XY

Biology. Identity. Equality.