Feature

Flood Control in Mines Studied by Government

Steam Blast Melts TNT out of Its Steel Shell

Code Chemicals for Index

Threshold for Sweating Determined by Tests

In Science Fields

Blood Wards off Disease

“Alloy X” for Gun Bores

Front Matter

Vacuum Tube Has Rival

Later Years Are Rated Special Concern of Women

Nova Formed by Big Shell Blown off Star’s Surface

Hydrogen Gas Robs Star