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Petroleum and its Derivatives

The Origin and Industrial Treatment of Mineral Oil

By David T. Day

The Oil-burning Steam Yacht “Cyprus”

Ocean Liner Principles Embodied in an Ocean-going Yacht

Prehistoric Mines in Belgium

Flint, the “Steel” of Prehistoric Man, Systematically Mined Underground

Our Present Physical Knowledge of X-Rays

A Synopsis of Their Most Important Properties

By Wheeler P. Davey

Electric Iron Production on a Large Scale

The Use of Concrete in the Construction of Roads

A Recent Development With Much Promise for the Future

By Charles E. Foote

A Simple Method of Counting Alpha and Beta Particles

Each Particle Registers Itself Automatically on a Photographic Record

By H. Geiger

The Invention of Celluloid

By L. H. Baekeland

The Manufacture and Uses of Blaugas

Compressed and Liquefied Oilgas for Transportation in Cylinders

By Hugo Lieber

Automatic Stabilizers

Curbing the Mississippi

Spending $500, 000 to Prevent the River from Cutting Off Thirty Miles of Itself

By James R. Crowe

Artificially Induced Pearl Production

By H. Lyster Jameson

Quantitative Colorimetric Analysis—II

Its Theory, Laboratory Methods and Apparatus

By G. A. Shook

Intensity of Hertzian Waves Varies According to the Weather


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