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Features

Queensboro Bridge a Safe Structure

Bearing of the Soo Canal Accident on Panama

Electricity

Engineering

Science

Some Tricks of the Moving Picture Maker

The Metropolitan Tower and the “Zeppelin II Two” Striking Comparisons

Signaling to Mars

Pipes in Bail Ingots

Large vs. Moderate-Sized Battleships

Felling a Water Tank

By W. H. Lawton

A Motor Plow

By Alfred Gradenwitz

The Construction of the Zeppelin Airship

Recent French Aeroplanes and their Performances

A Machine that Sets Ordinary Type

By M. M. Hunting

A Convenient Carrying Arrangement for a Drawing Outfit

By I. G. Bayley

Handy Man's Workshop

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  • Recently Patented Inventions

  • New Books, Etc.

  • Notes and Queries

  • Patents

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June 26, 1909

Beyond XX and XY

Biology. Identity. Equality.