Feature

Critical Coal Shortage

Air “Freight Trains”

Health of Armed Forces

Fuzes on 20-Pound Bombs Tested in New Wind Tunnel

In Science Fields

Adrift for Science

Nature Ramblings: Beneficial Disasters

Big Cargo Planes Coming

Ailerons with Hinges on Plane Wings Eliminated

New Machines and Gadgets

Mexican Murder Pit Only 500 Feet Deep

Front Matter