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Preliminary to a discussion of pneumatic experiments upon the ear, it will be a natural proceeding to describe the instrument by means of which we may produce and observe the effects of passive motion in the drum.
The pneumatic otoscope which I have devised for the purpose named consists of a small milled cylinder with an ear-funnel of the most serviceable pattern at one end, and an eye-piece containing a lens, around which revolves an adjustable mirror, at the other end. In the side of the cylinder a spacious aperture admits the light to the illuminating surface beneath. At the funnel end of the instrument is a pneumatic chamber provided with a flexible tube ending in a rubber bulb, or a diminutive syringe, or a lip-piece, as one may prefer. Objection might be made to using the lip-piece for producing suction for fear that the air from the external auditory
BISHOP SS. A NEW OTOSCOPE (PNEUMATIC) FOR THE DIAGNOSIS OF MIDDLE-EAR AFFECTIONS UNDER PASSIVE MOTION. AN IMPROVED TONSILOTOME. A NASAL SPECULUM. Read in the Section on Ophthalmology, Otology and Laryngology, at the Thirty-Ninth Annual Meeting of the American Medical Association, May, 1888. JAMA. 1888;XI(12):408–412. doi:10.1001/jama.1888.02400640012002
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