All physical bodies emit heat in the form of infra-red rays invisible to the human eye. Out of this simple scientific fact has grown an exciting and important new industry that is already big in missile and space work. Unlike more familiar uses of infra-redwhich use it as a heat source to cook foods quicklythe new applications need supersensitive detection equipment to receive infra-red and "see" the source it comes from. Infra-red detection now adds a new dimension to sight.
Unlimited Horizon. Detection by infra-red can perform incredible feats. A person...
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