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Features

An All-Day Race between Battleships

The Growth of our Railroad System

Guard Rails in the Subway

The Mysteries of the Ocean Bed

The Bacterial Purification of Sewage

By Albert Glyndon

The New Gasoline Motor Car

The Flax Industry of To-Day

Progress of the New Jersey Tunnels and Subways

The Lifting Power of a Screw Propeller for Aeronautical Work

A Novel Method of Dog-Shearing

The Salmon Fisheries of the Northwest

By Day Allen Willey

An Improved Excavator

Depth Gage for Brace Bits

Business and Personal Wants

Departments

  • Departments

    The Heavens in December - December 9, 1905

  • Index of Inventions - December 9, 1905

  • Notes and Queries - December 9, 1905

  • Recently Patented Inventions - December 9, 1905

  • Patents - December 9, 1905

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December 09, 1905

Beyond XX and XY

Biology. Identity. Equality.