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Concrete aggregates

By Sanford E. Thompson

New Type of Bascule Bridge

By Enos Brown

The Automobile in War


Reservoir Fountain, and Stylographic Pens.—II

Reservoir Pens

By James P. Maginnis

Practical Methods of Waterproofing and Fireproofing

By Koller

Gas Producers for Power

By Julius Wile

Contemporary Electrical Science

The Automatic Telephone: Its Merits and its Faults

By J. J. Carty

Lightning and the Electricity of the Air

Franklin'S Kite Experiment

By Alexander G. McAdie

History of the Standard Weights and Measures of the United States

Capacity Standards

By Louis A. Fischer

Some Facts about Yellow Fever

The Size of Molecules

The Discovery of Polarization

Wonders of Complicated Horological Mechanism

The Snow-Leopard or Ounce

The Production of Industrial Alcohol and its use in Explosive Motors

Electrical Notes

Engineering Notes

Science Notes

Trade Notes and formulæ


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    April 21, 1906

    20% Sitewide for President's Day