Man's physical universe


F"iG. 170. Theironsshown in this figure were heated

to produce the infra-red radiations which were

used in taking the photograph shown in Figure 171.

(Courtesy of the Eastman Kodak Company.)

Fig. 171. The photograph obtained using an

emulsion sensitized to infra-red radiations. The

irons were not hot enough to produce any visible

light in the perfectly dark room. (Courtesy of the-

Eastman Kodak Company.)


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