Scientific American Magazine

July 1909

Volume 101, Issue 3

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Features

Longer Daylight

Inconclusive Tests of the Scout Cruisers

Suburban Traffic in London and New York

Science

Engineering

Electricity

An English Electrically Operated Evaporative Condenser Plant

Frank C. Perkins

A New Electric Traveling Scale Crane

Walter Bailey

A Billiard Table for Ships

Harold J. Shepstone

Second Honorable Mention Essay on the Fourth Dimension

F. C. Ferry

A New Scotch Elevating Ferry

William Carlin

Signaling to Mars

The Proposed Montreal Drydock

The Number of our Ancestors

Constructing the Concrete Locks of the Panama Canal

H. Prime Kieffer

Foods and Digestion

Handy Man's Workshop

A Home-Made Saw Vise

James G. Newland

A Weatherboard Gage

I. G. Bayley

Iceless Refrigeration

Edward Thorpe

Quick Means for Finding the Center of Shafts

Albert Prather