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Features

The Influence of Brain-Power on History

Sir Norman Lockyer's Presidential Address to the British Association

A Criminal Sanatorium

Theories of Sleep

By Percy G. Stiles

Jenatzy Magnetic Clutch

Production of Coke in 1902

Manufacture of Stamped Envelopes

“Dim Religious Light”

Sun Dial with Electric Bells

Mining and Manufacture of Rock-Salt

3. Steam Evaporation

The World's Occupations

Time-Saving in Working with Logarithms

The Vernaison Suspension Bridge

By Emile Guarini

The Wireless Protocol

The Lebaudy Airship

The Ninth International Geological Congress

By E. O. Hovey

The Improved Longuemare Carbureter

The Paris Correspondent of the Scientific American

A New Projection Apparatus for Scientific Work

By L. B. Elliott

Electrical Notes

Engineering Notes

Trade Suggestions from United States Consuls

Selected Formulæ

Departments

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October 10, 1903

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