Feature

New Machines and Gadgets

Precision Calibrator for Aerial Cameras Developed

Color Change in Oysters

Cab-over-Engine Featured in New Helicopter

Books of the Week

Survival by Selection

Test Airsickness Remedy

[Photograph]: Carrier-Based Blimp

Toll Telephone Dialing

Lightweight Plastic Foam Is Good Insulating Agent

Tree Farming Is New Business

International Temperature Scale Has New Refinements