Science: Heat-Sensitive Eva

Electronic devices for seeing in very dim light have become commonplace, but all of them are blind in total darkness. Last week Baird Associates. Inc. of Cambridge, Mass, showed a recently declassified "camera" that needs no light at all, only infra-red (heat) radiation from faintly warm objects.

Baird's Evaporograph (Eva for short) is based on a prewar German idea which until recently was not followed up diligently. It has a concave mirror which concentrates heat rays as the mirror of an astronomical telescope concentrates light.

Just before they come to a focus, the rays...

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