Feature

Propellers Used as Brakes on Navy’s Largest Blimp

Guggenheim Fellowships

New Hammer for Firearms Is Patented by Garand

Two Novel Gun Mounts for Aircraft Patented

Male Brain Becomes Female through Chemical Change

New Machines and Gadgets

Sulfa for Gas Gangrene

Plenty of Gasoline

Front Matter

Nature Ramblings: A Sick Sadness

Better Skin Grafting

Giant New Calculator