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Features

Ultraviolet Energy

A Study of the Short Light-Waves from Economic Viewpoints

By M. Luckiesh

Using up Old Plumbago Crucibles

Radio Telephony—I

The Beginnings of Long-Distance Wireless Transmission of Speech

By E. B. Craft and E. H. Colpitts

Molecular Association and Chemical Combination

Are Cohesion and Chemical Affinity Forces of Similar Nature

By Felix Michaud

Familiar Insects through the Camera

Incidents in the Lives of Our Tiny Neighbors of Forest and Field Photographs Copyright by Brown and Dawson

The Ductility of Platinum

The New American Merchant Marine—II

A Plan for the Ownership and Operation of the Vessels Built for the Government by the U.S.Shipping Board

By Edward N. Hurley

Widening Demand for Blast Furnace Slag

Mechanics and Electricity

Analogies that Suggest Practical Experiments for the Student

By W. S. Franklin

Industrial use and Limitations of Respirators, Gas Masks and Oxygen Breathing Apparatus

Four tons of Lead in Paint for Ship

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    April 19, 1919

    Think Outside the Gift Box