Feature

Largest Ram-Jet Engine Ever Flown Passes Test

Amplify Electric Current

New Steps in Electricity

Front Matter

Comet 1947 n Was Not “Double-Headed” Comet

Hard to Control Weather

Russian Tip on Vitamin May Lead to New Industry

Rh Danger in Transfusions

Books of the Week

Rip-Stop Parachute Adds Safety to Plane Jumpers

[Photograph]: Testing GI Shoes

Early Attack Might Cure