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The Electric Smelting of Zinc Ore

By W. R. Ingalls

The Largest Railway Station in Europe

A New Railway Center at Leipzig, Germany

A Chapel on Wheels

Architectural Effects in Rolling Stock

By M. M. Hunting

Elements of Theoretical Aeromechanics

Part II Concluded. —Aerodynamics

By A. F. Zahm

Making the Blind Hear Light

Fournier d'Albe's Optophone

The Manufacture of Porcelain Insulators

Testing the Products for Leakage at High Tension

By Alfred Gradenwitz

The Use of High-Pressure Gas in Works

The Oldfield Patent Bill

Not the Law, But Its Administration at Fault

Vocational Disabilities Due to Defective Color Sense

A Handicap More Common Than Generally Supposed

A New Process of Preserving Eggs

Carbonic Acid and Nitrogen Gas as Sterilizing Agents

Forcing Plants by Means of Radium

Treatment Must Be Applied During “Period of Rest”

By Alfred Gradenwitz

New York's Enormous Annual Coal Consumption

The Coal Tonnage of New York City

By F. E. Seward

Experiments on Durability of Tool Steel

Cutting Tests at Different Cutting Speeds and With Different Cooling Mediums

By Edward G. Herbert


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