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Giant German and Austrian Cranes

Required in Navy Yards for Placing Turrets, Guns and Machinery

By Frank C. Perkins


Some of Its Problems and Reasons for Its Slow Progress

By W. C. White

Outline of the Coal Tar Chemical Industry

Wages in the German Factories

Our Unpreparedness against Military Devastation

The National Safety above Either Sectional or Political Interests

By Henry A. Wise Wood

Military Explosives—I

Their Chemistry, Preparation and Action

Kaolin in the Treatment of Bacteria Carriers

The Automobile Torpedo

Its Problems and Their Solution

The Jitney Problem—II

Its Regulation, Its Relation to Street Railways, and How They Can Meet the Movement

By J. C. Thirlwall

Vaccine Virus not the Cause of Tetanus

Pyrometers for Shop Use

Principles Governing the Design and Construction of Electrical Pyrometers

By J. M. Johnson

The Bacterial Flora of Trees and Men

Some Characteristics of Bacilli that have Been Little Studied

By Stephen J. Maher

Lightning and Lightning Rods


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