Feature

Camera Aids Air Safety

Front Matter

Extensible Smallarms Stocks Invented at Arsenal

Lignin Put to Work

Vehicle inside Own Tread for Use in Marshes

New Transport Plane

[Photograph]: Camera of the Seas

Galaxies Group Enlarged

New Machines and Gadgets

[Photograph]: Outwears Rubber

Medical Research Teams to Study Explosion

Deaths in Large Cities Show Big Increase