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The Aeroplane Military Scout

Mechanical Handling of Materials

By Richard Devens

Electrical and Chemical Effect of Ultra-violet Rays

The Hertz Effect

The German Antarctic Expedition

Its Personnel and Its Equipment

A Modern X-Ray Laboratory

The Interrupter or “BreaK “

By Reginald Morton

The Past and Present Geographical Distribution of the Iron Industry of the United States, Protection of Underground Pipes from Electric Currents, and more

Fire and Burglar-Proof Safes.—I

Recent Advances in the Construction

By E. E. Watson

A Bituminous Rock Quarry

By Joseph Anthony

Charles Darwin—III

By August Weismann

The Modern Motor Car

Ten Years' Progress

By W. W. Beaumont

Poisoning by Gas from Heaters, Wireless Receiver Trouble

The Maurice Farman Biplane

Scale Drawings of the Machine that Flew from Paris to the Puy de Dome

The Chemistry of Inks in Handwriting

Things the Expert Must Know

By C. Ainsworth Mitchell

Notes on the Economics of Locomotive Operation

The Problems Presented by Increasing Size

By Arthur J. Wood


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