Economy in Study
Psychological and Physiological Points on How to Study to the Best Advantage
Volume 80, Issue 2063supp
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Features
Gun-Primers and Detonators
A Radio Generator for Amateurs
Instructions for Fitting Up a Powerful and Efficient Source of Current
Facts about Thunderstorms
Their Origin Formation and Structure
Problems of Geographic Influence
Its Relations to Sociology, Biology, and Climatology
Use of Electricty in Ships
Elements with Several Atomic Weights
The Manufacture of Chicory
A Franco-Belgian Industry Stopped by the War
Power with By-Product Recovery
Relative Merits of Various Prime Movers in Relation to Scientific Utilization of Fuel
Indicating Temperatures
Cleaning Discolored Marble
Recent Progress in Astrophysics—I
Many Important Discoveries That Add to Our Knowledge of the Heavenly Bodies
The Power of Telescopes
Identifying Minerals and Precious Stones
Chemical Lime
Some of the Technical Applications of This Economical and Useful Material