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During the course of laryngeal or bronchoscopic examination of patients whose bronchial secretions are profuse, considerable annoyance and loss of time are occasioned by the frequency with which the examiner's protecting goggles become clouded and require cleaning. To obviate this time-consuming difficulty a pair of self-cleaning, or self-replacing, goggles was constructed, description and photographs of which we herewith present:
The main feature of the apparatus is a roll of clear, uncoated film support mounted on two rollers so placed in their supporting frame that the film, in winding from one roller to the other, passes across the line of vision. The receiving roller is supplied with a winding and ratchet mechanism actuated by down and up movements of a cross arm, which, in turn, is actuated by opening and closing of the jaw. That portion of the film which has not yet passed before the examining eye (with this instrument,