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SA Supplements Vol 43 Issue 1120supp

SA Supplements

Volume 43, Issue 1120supp

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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

Miscellaneous Notes

Engineering Notes

Electrical Notes

Gravitation Stamp Mills for Quartz Crushing

Apparatus for Cooling Water of Condensation

The Progress of Gas Engines

Foster's Film Evaporator

Lessons from American Railroads as to Cheap Transportation

W. R. Stirling

The Hotchkiss Automatic Machine Gun

Fuel Energy into Electrical Energy

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

E. Bertrand

Labor Insurance in Germany

The Theory of Dreams

Fuller's Earth

Patents!

Influence of Intellectual Work on Blood Pressure