The diseases of the ear and their treatment . lamp, sup-plied with a large burner, issufficient. The light may beintensified by placing aroundthe flame a metal or earthen-ware cylinder, with a longi-tudinal slit in it. Duringthe examination, the ear ofthe patient is turned awayfrom the source of light, andthe rays which fall upon themirror of the observer arereflected into the ear. Thelamp is placed at the righthand of the patient, and ona level with his ear (Fig. 2). The mirror required forthis examination is concave,having a focal distance of15 to 20 cm., and in itscentre a hole about 1
The diseases of the ear and their treatment . lamp, sup-plied with a large burner, issufficient. The light may beintensified by placing aroundthe flame a metal or earthen-ware cylinder, with a longi-tudinal slit in it. Duringthe examination, the ear ofthe patient is turned awayfrom the source of light, andthe rays which fall upon themirror of the observer arereflected into the ear. Thelamp is placed at the righthand of the patient, and ona level with his ear (Fig. 2). The mirror required forthis examination is concave,having a focal distance of15 to 20 cm., and in itscentre a hole about 1 diameter. It is either furnished with a handle (Hoffman, VonTröltsch) or it is fixed on the brow of the examiner, generally bymeans of a head-band. As the left hand is required for holdingthe speculum, the hand-mirror, if used, must be held in the righthand. But as certain manipulations are frequently necessary inorder to make a thorough examination of the membrana tympani,and as one hand must be free for the treatment, the hand-mirror is. AND REFLECTED LIGHT. n rarely used. The mirror can be most simply and efficiently em-ployed when fastened to the head-band (Fig. 2). A mirror of alarge size is also suitable for rhinoscopy and laryngoscopy. It isfitted to the head-band in a variety of ways ; and as mobility in alldirections is of the greatest importance, the manner of fastening it,as represented in the illustration, seems the most suitable. Thecontrivance consists of a double ball-joint, which allows the mirrorto be moved in all directions. The mobility of many head-mirrorsis so limited that an examination is rendered very difficult. Czermak fixed the mirror to a plate which is held between theteeth. This mode of fixture may be recommended most to thosewho cannot use the head-band. Such a mirror is very handy, as itoccupies very little space in the instrument case. The mouth-plate mirror, which the writer employs, is also furnished with adouble ball-joint. It can be used v
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Keywords: ., bookcentury1800, booksubjectear, booksubjecteardiseases, bookyear
