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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...
...Baird Associates workers had lots of fun looking at distant islands in Boston harbor on pitch-black nights and taking darkroom pictures of the office staff. One of the girls, photographed by the heat-rays flowing out of her skin, proved to have a cold nose...
Many nonmilitary uses are also showing up. Since Eva was declassified, Baird Associates has been getting inquiries from industries that want to chart hot spots in electronic apparatus, find flaws in hot metal parts. Another obvious use is to check the insulation of a building by taking a snapshot of the heat escaping through its walls...
...JOHN E. BAIRD...