An Army Railroad Howitzer, How Refrigerator Insulation is Made, and more

New Type of Steam Motor Car

Solution of Steam-Car Difficulties by Introduction of Gas-Car Elements

Strategic Moves of the War, December 14th, 1916

By Our Military Expert

The New President of the American Association for the Advancement of Science, Russian Graphite, and more

How Waste Paper is Treated to Make New Paper

An Account of Processes and the Difficulties to be Overcome in Removing Printer's Ink

Concrete Cottages from a Catalogue

Evolution of the Rigid Airship Design

Present Status of Zeppelin Construction