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Changing a Four-Crown to a Single-Crown Pulley

Deep Sea Hospital Ships

The Sneeze and its Diagnostic Value

How a Storage Battery Works

The Apothecary

By J. W. Wainwright

Utilization of Energy in Wireless Telegraphy

An Ingenious Portable Electric Drill

American Ethnology

The Labyrinth of Crete

A New System of Seasoning Wood with Saccharine or Sugar

The making of the Clay Pipe

Artificial Marble

Methods of Measuring Velocity in River Channels

By H. A. Pressey

Causes of Explosion of Acetylene and means of Preventing Them

Experiments in Radio-Activity, and the Production of Helium from Radium

The Future of Coal Gas

Fuels other than Coal and Wood

An Automobile Supported by a Man

Contemporary Electrical Science

Walking on the Head

The Botanical Laboratory of the Carnegie Institution

Electrical Notes

Engineering Notes

Trade Notes and Recipes

Trade Suggestions from United States Consuls

Selected Formulæ


  • Departments

    Patents - September 5, 1903

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