Diseases of the nose and throat; a text-book for students and practitioners . of an inch. The connection with the battery is madethrough an insulated mirror-handle. In this way the head-mirror is obviated, but the heat of the incandescent lamp is oftenuncomfortable, and its presence in the axis of vision is apt toobstruct the laryngoscopic view. Fig. 93 illustrates a moreconvenient method of controlling lime-light than does the morecumbersome apparatus of Fauvel or Mackenzie. Essentially the same position and illumination are employedfor laryngoscopy as for posterior rhinoscopy; the reflector
Diseases of the nose and throat; a text-book for students and practitioners . of an inch. The connection with the battery is madethrough an insulated mirror-handle. In this way the head-mirror is obviated, but the heat of the incandescent lamp is oftenuncomfortable, and its presence in the axis of vision is apt toobstruct the laryngoscopic view. Fig. 93 illustrates a moreconvenient method of controlling lime-light than does the morecumbersome apparatus of Fauvel or Mackenzie. Essentially the same position and illumination are employedfor laryngoscopy as for posterior rhinoscopy; the reflector should THE LARYNGOSCOPE AND LARYNGOSCOPY. 343 throw the light into the mouth so that the point of greatestillumination shall be near the base of the uvula. This is to bedone by turning the head-mirror in different directions, alwaysremembering that the angles of reflection and incidence areequal. AVhen the light has been thrown in the proper direction,with the examiners head in a comfort-able position, the laryngeal mirror is takenin the hand, as in writing with a pen (see. Fig. 92.—The S WiiiTK Dental Mfg. Electric Laryngoscope. Figs. 92, 9-i), and tlie glass surface held directly over the lightfor a few seconds, or until the surflice is so warm as to prevent theexhaled moisture from condensing upon it. Before introducingthe mirror into the mouth, the metal back should be placedagainst the palm of the hand, to determine its temperature; itshould be warm enough to prevent condensation of the exhaled 344 DISEASES OF THE NOSE AND THROAT. moisture upon its surface, but not sufficiently hot to do violenceto the delicate mucous membrane of the mouth and prefer to dip the mirror into hot water and then wipe itdry. In order to prolong the examination the surface of themirror may be coated with glycerin; condensation is thus pre-vented, but the image loses in distinctness. In order to obviatethis blur. Dr. Henry Wright devised an ingenious plan forkeeping the mirror
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherph, booksubjectnose
