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Features

Dresden's Newest Theater

Greek Architecture–The Lighting of Temples

Needed Inventions

By Robert Grimshaw

Fan and Engine for Forced Draught

Progress in the Iron and Steel Industries

Cooper and Wigzell's Sounding Apparatus

By Charles Bright

Geodetic Operations in the United States

Dr. Hans Meyer's Latest Kilimanjaro Expedition

Telephone Service in Foreign Countries

The Exploring Radioscope

Mammoth Ivory

By R. Lydekker

The Preparatory Work in Grapevine Culture

The Grand Canon of the Colorado

By Ralph S. Tarr

The Rhinopitheci

Engineering Notes

Selected Formulæ

Trade Suggestions from United States Consuls

Patents!

Departments

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