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Report of the Chief of Ordnance

The Composition of the Upper Atmosphere

Honor to Whom Honor is Due




An Automatic Electric Fog-Signaling Apparatus for Railroads

Rat Destruction by Electric Current

Portable Outlooks for Artillery Trains

By Alfred Gradenwitz

Early Suggestions of Invading England by Balloon

A Heat Paradox

Latin-American Trade

Trees as Witnesses in Early Surveying

Sheet Lightning

Commander Peary's Discovery of the North Pole

How Cook Made His Latitude Observations

Capt Cody's British Army Aeroplane

A Cheap Lamp Rheostat

By F. P. M'dermott Jr.

Vise for Polished Pipe

By A. V. Searing Jr.

Handy Man's Workshop

Simple Tapered Reamer

By Albert F. Bishop

Temporary Repairs to Broken Springs

The Cold Process of Making Sirup

By Thaleon Blake


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September 18, 1909

Science for the Modern World