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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

The Automatic Telephone: Its Merits and its Faults

By J. J. Carty

Contemporary Electrical Science

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

The Size of Molecules

Some Facts about Yellow Fever

The Snow-Leopard or Ounce

Wonders of Complicated Horological Mechanism

The Discovery of Polarization

The Production of Industrial Alcohol and its use in Explosive Motors

Science Notes

Electrical Notes

Engineering Notes

Trade Notes and formulæ


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