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Features

Good News from Panama

As Others See Us

Naval Annuals of 1909

Science

Electricity

Engineering

Baseball at Night

The First Attempt at a Cross-Channel Flight and New French Cross-Country Records

Construction of an Ellipse

How the Peace Could be Kept Internationally

Speed of the Mauretania

A New Process for Damascening, Inlaying, and Blending Metals

BY THE ENGLISH CORRESPONDENT OF THE SCIENTIFIC AMERICAN.

The First of the 1909 Flights for the Scientific American Trophy

Handy Man's Workshop

Experiments with Alternating Current, Using a Small Direct-Current Motor

By F. P. M'dermott

A Ladder Extension Leg

By I. G. Bayley

Device for Removing Broken Wood Screws

By G. H. Sinclair

Automatic Lubricating Cup

By W. J. C.

Departments

  • Departments

    Correspondence - July 31, 1909

  • The Heavens in August

  • Patents - July 31, 1909

  • Recently Patented Inventions - July 31, 1909

  • Index of Inventions - July 31, 1909

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July 31, 1909