Features
Photography Identifies Gems by their Flaws
Walking on Water
St. Louis Buries a River
Accuracy in "Talkie" Equipment
Zoogenesis
The New Theory of Evolution
Dining in a Refrigerator!
Built of Mud
Basic Patents in Evolution--I
The "Green Flash" and Other Odd Phenomena
Film Yourself for a Quarter
Perfume
The Eight-Inch Gun Cruiser
A Home Made Microscope for the Amateur
Work and Fatigue
Industrial Fatigue Is Passing Out of Style
Rome's Slums Reveal Imperial Ruins
The Imperious Sycamore
"Clear are the depths where the eddies play, And the dimples deepen and hurl away; And the plane tree's speckled arms o'ershoot The swifter current that mines its root." -Bryant
Vegetables that Defeat Goiter
Mechanical Silkworms
'Panama' Hats From the Pacific
The Amateur AstronomerTelevision Enters the Home, August 1930
Departments
- Departments
Across the Editor's Desk, August 1930
Back of Frontispiece, August 1930
Our Point of View, August 1930
Movie Camera as an Aid in Testing, Fire War on Pests and more
Current Bulletin Briefs, August 1930
