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Features

Automobiles in the Great War—I

Types of Cars Used and Technical Details Considered in the Light of Experience

By W. F. Bradley

Elevation of the Aurora Borealis

Feeding the Firing Line

By Walter S. Hiatt

Shadow Pictures by Parallel Rays

Negatives Produced Direct, Without a Lens

Shooting Soot from Chimneys

Water Pressure

The U. S. Government Libraries at Washington

Important Institutions of Great Value to the Nation

By H. H. B. Meyer

Cutting Efficiency and Hardness of Tool Steels

By J. O. Arnold

Producing High Vacua

British Methods of Handling Coal

Great Machines Employed for Loading Vessels at the Docks

By James Steelman

A Generating Station Danger

Contagion from Clothing

Modern Views of the Sun—II

An Important Star Whose Real Nature Is Only Beginning to Be Understood

By J. S. Plaskett

An Electrically Conducting Paint

The Process of Case Hardening

A Method of Heat Treatment, of Great Importance in the Mechanical Art

By R. A. Millholland

Bird Houses

Hints on Their Construction, Location and Care

By Ned Dearborn

The Preparation of Surgical Catgut

A Mica X-Ray Spectrometer

The Economic Possibilities of the Danube as a Cosmopolitan Highway

The Determination of the Resistance of Ships

A Review of Recent Investigations Relating to Powering Different Types of Vessels

By H. Rigg

Plasticity and Viscosity

Mica in Russia

X-Rays and the Theory of Radiation

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    July 29, 1916

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