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Features

The Steamship “George Washington”

Marine Engineering, Past, Present, Future

From Reciprocating Engine to Turbine

The Advantages of Rich Mixtures in Concrete Construction

By E. S. Larned

Aerial Propellers

Old and New Forms

By Sidney H. Hollands

The Hygroscopic Power of Core

Explosion Gas Turbine or Combustion Gas Turbine?

Diagram of Electric Wave—Lengths

The Simplification of Calculating Wave Lengths

By W. W. Massie

Influence of Temperature on Radio-Active Transformations

A Simple Calculator

Some New French Toys

Exhibits at the Recent Lepine Exposition

Radioactive Elements

Their Number and their Properties

By A. T. Cameron

Improved Health of the British Army in India

A $500 Prize for a Simple Explanation of the Fourth Dimension

Concrete Pier at Santa Monica, Cal

The Second Concrete Pier in the World

By C. B. Irvine

The Brotan Locomotive Boiler

A New Engine Without Copper Plates and Braces

Photographic Developing

An Account of two Modern Methods

Sands their Relation to Mortar and Concrete

Drifting to the Pole

Singing and Speaking Stones

Some Ancient and Modern Wonders

By Georg Rosenfeld

Moving Water and Animals

The Effect of Agitated or Moving Water

By Armand Billard

Disinfectants

White Throats

A Study of a Common Bird

By M. J. Nicoll

An Animal as an Engineering Structure

Some Factors of Safety Provided by Nature

By S. J. Meltzer

Engineering Notes

Trade Notes and Formulae

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    December 19, 1908

    Help Us Reforest the Mississippi River Valley