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Features

Metallic Filaments for Electric Lamps

Electrically-Operated Pneumatic Hammers

By Frank C. Perkins

“Ounce Metal”

Improvements in Gas Lighting

Is the Sixteen Candle-Power Standard for Electric Lamps out of Date?

The Fireproof Dynamo

How to Construct an Independent Interrupter

By A. Frederick Collins

Experimental Theater Conflagrations

The Collecting and Testing of Carbonic Acid for Purposes of Carbonization

Treatment of Rivers with Shifting Channels

Greenhouse and Conservatory Heating

By A. S. Atkinson

Herculaneum

Pajarito Ruins—Their Accessibility

By Hugh H. Harris

Mars as a Place to Inhabit

Gas as a Source of Power.—I

Generation of Producer, Mond, and Blast Furnace Gases

By Willard L. Case

A New Process of Sterilizing Corks

How Seeds are Carried.—IV

IV. Seeds scattered by Propulsion

By Craig S. Thoms

Yellow Fever and Sanitation

By J. N. Hazlehurst

The Gas-Turbine and the Turbine-Compressor

A Magnetic Indicator of Temperature for Hardening Steel

By William Taylor

Electrical Notes

Science Notes

Engineering Notes

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    December 15, 1906

    Beyond XX and XY

    Biology. Identity. Equality.