. Diseases of the throat and nasal passages; a guide to the diagnosis and treatment of affections of the pharynx, sophagus, trachea, larynx, and nares . Fig. 19.—Examination by diffuse daylight reflected from concave mirror attached to the forehead. employed to attach the reflector to the head. If the reflectorbe perforated (Fig. 20), it may be placed in front of one eye;if not perforated, it is placed in frontof the forehead. Under any circnm -stance the mirror must be so mountedas to be susceptible of being inclinedin any direction. The light is thenreceived upon the reflector, and thenceref
. Diseases of the throat and nasal passages; a guide to the diagnosis and treatment of affections of the pharynx, sophagus, trachea, larynx, and nares . Fig. 19.—Examination by diffuse daylight reflected from concave mirror attached to the forehead. employed to attach the reflector to the head. If the reflectorbe perforated (Fig. 20), it may be placed in front of one eye;if not perforated, it is placed in frontof the forehead. Under any circnm -stance the mirror must be so mountedas to be susceptible of being inclinedin any direction. The light is thenreceived upon the reflector, and thencereflected into the mouth, upon thespot to be occupied by the laryngo-scopy mirror, say at a distance ofabout three inches (its average dis-tance from the glottis) from the focalpoint of the reflector. Examination by Artificial Light. —Artificial illumination is used either by direct or by reflected light. Direct light is preferred in France ; reflected light in Germany, Great Britain, and to^5tf*5SSTEfSPS! the United States. SSffS*shown *P°siti°n f°r c°v. 38 EXAMINATION OF THE THROAT AND NASAL PASSAGES. The best light to use is that of gas, or coal oil. Coal oilfurnishes the whiter and more constant light; gas is the moreconvenient in management. The light from coal oil can berendered more brilliant by dissolving a little camphor in theoil. Whale oil and even candles may be used, , calcium, and even electric lights are used onaccount of their intensity by some practitioners, chiefly teach-ers, and by some of them merely for class instruction. Theyare unnecessary. The naked flame may be used for illumination, but in orderto concentrate the power of the light it is customary to place acondensing lens in front of it. The name from a circular or
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectnose, bookyear1879
