Volume 106, Issue 23
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Features
Radiographic Study of the Effect of Exercise on the Heart, Exercising in Bed, Ripening Dates Artificially and more
The Great Tower Telescope of the Mt. Wilson Solar Observatory
A Description of the World' s Largest Reflector
Crop Improvement: A Problem in Increasing Our National Efficiency
Panama-Personal Impressions of the Work-II
The Gigantic Slides in the Culebra Cut
Wilbur Wright
The Passing of a Great Inventor
A Thermo Magnetic Motor and Generator, Reproducing Engravings without Light
The Laboratory
Some Suggestions for Home Experiment
How to Remove Lead Sulphate from Lead Plates, Bifunctional Formation of Storage Battery Plates and more
What Inventors are Doing
Simple Patent Law : Patent Office News; Inventions New and Interesting