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The Airship Service on Lake Lucerne

By Our Berlin Correspondent.

Animal Heat

Living Chemical Engines

By David Fraser Harris

The Practice and Theory of Aviation.—II

The Leading Aeroplanes

By Grover Cleveland Loening

Telegraphy and Telephony

Recent Developments

By John Gavey

Metallic Radium

Artificial Camphor

Its Industrial Future

By G. Blanc

Electrical Radiations in Nature

The Electrical Phenomena of the Sun and Stars

By E. Gehrcre

Trackless Electric Roads

The Present State of the Art

By A. Heller

The Study of Solutions

Past Theories and Future Research

By Louis Kahlenberg

Science Notes

Trade Notes and Formulæ

Electrical Notes


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