Feature

Copper-Covered Wire Good for High-Frequency Lines

No Engine Changes Needed to Use Low Anti-Knock Gas

First Glances at New Books

Front Matter

Film Protects Radio

[Photograph]: Tougheners

New Operation for Repairing Torn Nerves

Empyema Remedy Found in Disinfectant and Detergent

Safety Hand Truck Invented for Moving Explosives

Wallace Visits Institute

Dornier Seaplane Design Has No Wing Floats

Spread of Ills Predicted