Features
Latest Photographs from Persepolis
The Carolina Bays--are they Meteor Craters?--I
A Request for Data on Apparitions
Our Second Test of Telepathy
Is Sexual Abstinence Harmful?
Learning to Use the Instrument
Where Astronomers when they Die
The Lessons of 50,000,000 Miles of Flying
A Real 'Electric Eye'
"Mass Production" Welding
Flameless, Arcless Process Produces Thousands of Welds an Hour Under the Supervision of One Man
Checking Up on the Silkworm
The Amateur Astronomer, September 1933
Departments
- Departments
Across the Editor's Desk, September 1933
Back of Frontispiece, September 1933
Giant Sculptures of Ancient Persia
Our Point of View, September 1933
Scientific American Prize Awards, Antitoxin and Scarlet Fever and more
Current Bulletin Briefs, September 1933
Books Selected by the Editors, September 1933
Beer and Liquor Trademarks, Trademark Cancelled and more
