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Honor to Whom Honor is Due

The Composition of the Upper Atmosphere

Report of the Chief of Ordnance




An Automatic Electric Fog-Signaling Apparatus for Railroads

Rat Destruction by Electric Current

Portable Outlooks for Artillery Trains

By Alfred Gradenwitz

A Heat Paradox

Trees as Witnesses in Early Surveying

Sheet Lightning

Latin-American Trade

Early Suggestions of Invading England by Balloon

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.

Temporary Repairs to Broken Springs

Simple Tapered Reamer

By Albert F. Bishop

The Cold Process of Making Sirup

By Thaleon Blake

Handy Man's Workshop


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September 18, 1909

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