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Some time previously, Kennedy had had installed on the window ledge one of those mirror-like arrangements, known as a "busybody," which show those in a room what is going on on the street. As I moved over to look at the bolometer, I happened to glance into the busybody and saw that a crowd was rapidly collecting on the sidewalk. "Look, Craig!" I called hastily. He hurried over to me and looked.
To this prismatic distortion was owing the establishment of a pseudo-maximum of heat in the infra-red, which disappeared when the natural arrangement by wave-length was allowed free play. Langley's bolometer has shown that the hottest part of the normal spectrum virtually coincides with its most luminous part, both lying in the orange, close to the D-line.
By means of an ingenious modification of the electrical pyrometer, named the bolometer, valuable researches in measuring solar radiations had been made by Professor Langley. Faraday's great discovery of magneto-induction was next noticed, and the original instrument by which he had elicited the first electric spark before the members of the Royal Institution in 1831, was shown in operation.
"I will now show you, my dear young lady," almost hissed the Clutching Hand at length, "as pretty a game of hide and seek as you have ever seen." As he said it, another trap door near the infra-red ray machine was opened and a beam of light burst through. I knew it was not that which we had to fear, but the invisible rays that accompanied it, the rays that had affected the bolometer.
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