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Craig-Goch Dam, Birmingham, England

The Age of Cement

Use of Concrete for Railway Ties

The Problem of the Screw Propeller

By John Lowe

Note on the Fractional Condensation of Air, with a View to the Commercial Production of Oxygen

By Ernest A. Le Sueur

Pumping Plant at the Milke Collieries, Japan

The Mathematics of Mufflers for Gasoline Engines

Oil from Livers of Cod and Related Species

Sources Of Supply

By Charles H. Stevenson

Recording Alternating-Current Waveforms by Duddell Oscillographs

By the English Correspondent of the Scientific American

Recent Discoveries at Pompeii

How Animals Detect Poison

Foreign Bodies in the Stomach

The Heredity Factor in Technological Education

Still Hunting

An X-Ray Tube with Adjustable Focus

By R. V. Wagner

On the Measurement of Certain very Short Intervals of Time

Electrical Notes

Engineering Notes

Trade Suggestions from United States Consuls

Science Notes

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May 28, 1904

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