Volume 70, Issue 1805supp
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Features
Boiler Incrustations
Superheating at Sea
Is it Advisable?
Our Inefficient Industrial Organization
Staff and Line in the Workshop
New Rubber Compound
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
To Harden Hack-Saw Blades in Quantities
The Determination of Radium
Spent Tan as a Fuel
Recent Progress in Aviation—III
The Present State of the Art
Aeroplanes at Rheims
The Lessons of the Great Aviation Meeting
How Old is the Earth?
Billions Invested in Electricity
The Latest Census Returns
Savage Races and Photography
A Locomotive Speed-Gage
A New Electrical Device
Hybrid Butterflies and Moths
A Study of Them in Captivity
John Dalton and his Achievement
A Glimpse across a Century.