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The Stope Drill Competition

By George Watson

Boiler Incrustations

Superheating at Sea

Is it Advisable?

New Rubber Compound

Our Inefficient Industrial Organization

Staff and Line in the Workshop

By Harrington Emerson

The Silent Chamber at Utrecht

Novelties in Invention

Some French Curiosites

The Radio Scope

Measuring Radio-Activity by our Correspondent

Light and Electromagnetism

Electric Waves and the Electromagnetic Theory of Light

Spent Tan as a Fuel

To Harden Hack-Saw Blades in Quantities

By James Cran

The Determination of Radium

Recent Progress in Aviation—III

The Present State of the Art

By Octave Chanute

Aeroplanes at Rheims

The Lessons of the Great Aviation Meeting

Billions Invested in Electricity

The Latest Census Returns

How Old is the Earth?

Savage Races and Photography

A Locomotive Speed-Gage

A New Electrical Device

By Alfred Gradenwitz

Hybrid Butterflies and Moths

A Study of Them in Captivity

By Kurt John

John Dalton and his Achievement

A Glimpse across a Century.

By R. M. Wenley

Astronomical Methods and Instruments

Science Notes

Engineering Notes

Trade Notes and Formulæ


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