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Lhasa and Central Tibet.—II

By G. Ts. Tsybikoff

Mexico to Explore an Ancient Otomite City

The Tantalum Lamp

By W. Von Bolton and O. Feitcrlein

Steam Heating Principles

By Willam J. Baldwin

The Utilization of Waste Energy

A Powerful Light-Weight Gasoline Motor for Aeronautical Purposes

A New Belgian Process of Manufacturing Weldless Chains

By Emile Guarini

Developments in Heavy Electric Traction

Photograph of Electric Spark

Meteorology in the British Empire

By John Eliot

Experimental Electrochemistry

Assistant Professor of Chemistry in the George Washington University, Washington, D. C

By N. Monroe Hopkins

The Ascent of Water in Trees


The Astronomy of the Old Testament

Electrical Notes

Engineering Notes

Science Notes

Trade Notes and Recipes


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