Volume 143, Issue 4
You are currently logged out. Please sign in to download the issue PDF.
Features
A 1400-foot Dive
Moonscapes
Housekeeping Aboard a Battleship
Stone From Hot Mineral Springs
Can We Signal to the Planets?
Scientific Criminology
How Bullets and Firearms Are Matched for Identification
My Experience in Amateur Telescope Making
Experiments With "Wonder Creatures"
The Largest American-Made Telescope Mirror
The Development of the Columbia River
A Reclining Chair Night Coach
Measuring the Distance to the Stars
Marsh Delta Lands Become Rich Farms
Our Army's New Super-Weapon
Basic Patents in Evolution--III
Ctesiphon, A Magnificent Fragment
The New Fifty-foot Stellar Interferometer
Mount Wilson Observatory