The Nature of Things

The Infra-Red (3x21)

:

Detection of heatwaves by Special infra-red receptors has many industrial, military and other uses. In the animal kingdom, pit vipers (rattle-snakes and others) locate their prey by means of heat-sensitive organs. Dr. Harry Pullan of the R.C.A. research laboratories, Montreal, describes the properties of the infra-red and demonstrates technological applications.