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"Yes. The detectascope enables you to see what is going on in another room. The focus may be altered in range so that the faces of those in the room may be recognized and the act of passing money or signing cheques, for instance, may be detected. The instrument is fashioned somewhat after the cytoscope of the doctors, with which the human interior may be seen." "Very remarkable," exclaimed Clare.
The focus may be altered in range so that any one in the room may be seen and recognised and any action of his may be detected. The original of this was devised by Gaillard Smith, the adapter of the detectaphone. The instrument is something like the cytoscope, which the doctors use to look into the human interior. Now, look through it again. Do you see the closet?" Again I looked.
It was a detectascope, invented by Gaillard Smith, adapter of the detectaphone, an instrument built up on the principle of the cytoscope which physicians use to explore internally down the throat. Only, in the end of the tube, instead of an ordinary lens, was placed what is known as a "fish-eye" lens, which had a range something like nature has given the eyes of fishes, hence the name.
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