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Features

The Methods and Instruments used in Astrophotography

Curious Weapons

The Boomerang and its Origin—War Quoits and Knobkerries—the Blowpipes of the Dyaks

Green Fruit Worms

Selected Formulæ

Electrical Notes

Miscellaneous Notes

Engineering Notes

Apparatus for Cooling Water of Condensation

Gravitation Stamp Mills for Quartz Crushing

Foster's Film Evaporator

The Progress of Gas Engines

Lessons from American Railroads as to Cheap Transportation

By W. R. Stirling

Fuel Energy into Electrical Energy

The Hotchkiss Automatic Machine Gun

The Practice of the Combined Open Hearth Process of Messrs Bertrand & Thiel

By E. Bertrand

Labor Insurance in Germany

The Theory of Dreams

Fuller's Earth

Influence of Intellectual Work on Blood Pressure

Patents!

Departments

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    June 19, 1897

    Think Outside the Gift Box