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Illuminating Devices in the Great War—I

An Account of Aerial Lighting Devices and Their Development from 1914 to the Armistice

By H. M. Brayton

Oil and Coal: Oil Consumption: Dwindling Coal Output

By W. B. Robinson and J. T. Smith

Frost in the United States

Important New Frost Maps in the “Atlas of American Agriculture” and What They Show

By Robert De C. Ward

Clouds Induced by Forest Fires

By Ford A. Carpenter

Heights of Cumulus Clouds Forming over Fires

By S. P. Fergusson and C. F. Brooks

Oil and Coal as Rivals, Metal Carbides Borides and Silicides and their use in Metallurgy

By J. T. Smith

Origin of American Agriculture

Ancient Pottery Reveals the Invention and Spread of Agriculture in America

By Herbert J. Spinden

Specific Nutritive Values

German Experience Which Goes to Show the Indispensable Nature of Butter or a Real Equivalent

Effect of Fog on Light Intensity

Relative Intensities of Different Colored Lights in Fog

By C. L. Utterback

Experimental Wireless Telegraphy and Telephony—IV

Crystal Detectors, Telephone Receivers, Receiving Coils and Condensers

By Louis Gerard Pacent and Austin C. Lescarboura

Separating Visible from Invisible Light, Military Camouflage, and more

By W. S. Andrews

Hull Form for High Speeds

The Ultra-Violet and Visible Transmission of Eye-Protective Glasses, Back Numbers of the Scientific American Supplement

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    August 23, 1919

    Think Outside the Gift Box