A Few Astronomical Events of the Past Fifty Years
What Photography and the Spectroscope have Revealed to us
Volume 82, Issue 2137supp
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Features
How to Maintain Concrete Roads and Streets
A New Portable Accumulator
Where the Motor Truck has Displaced the Horse
Records made Hauling Heavy Logs in Washington Forests
Bergson's Theory of Intellect and Reality—II
Is our Intellect Limited in its Powers?
Alloys for Thin Ornamental Castings
Nitrogen Oxides from Ammonia for the Lead Chamber Process
The Manufacture of Big Chains
An Important Product that is Still Made by Hand
What is Karaya Gum?
Cadmium in Spelter
The Conifer Leaf Oil Industry
The Species used and Methods of Production Employed
Force of Impact between Vehicles in a Moving Train of Cars
Experiments in the Cultivation of the Cork Tree in Sardinia
The Intermittent Annual Growth of Woody Plants
And some Effects of Geographic or Climatic Variations
Sound Waves and Zones of Silence
Measuring Wind Forces
The Problem of Life
And the Economic Waste of Sickness and Premature Death