A text-book of the diseases of the ear and adjacent organs . Fig. 63.—WildesSpeculum. Fig. 6 I —EhrhardSpkculum. Fig. 65.—The AuthorsSpkculum of Vulcanite. judicious illumination the view of the membrane will therefore appearclearer than with the same light reflected from a polished metal speculum. The different sizes, 8. 6, 4, and 2 mm. in diameter at the aperture(Fig. 65), are constructed to suit various meatuses. Reflector. —These specula, combined with a reflecting concave mirrorperforated in the centre, 7-8 cm. in diameter and of 10-15 cm. focaldistance, allow, with sufficient light, an a
A text-book of the diseases of the ear and adjacent organs . Fig. 63.—WildesSpeculum. Fig. 6 I —EhrhardSpkculum. Fig. 65.—The AuthorsSpkculum of Vulcanite. judicious illumination the view of the membrane will therefore appearclearer than with the same light reflected from a polished metal speculum. The different sizes, 8. 6, 4, and 2 mm. in diameter at the aperture(Fig. 65), are constructed to suit various meatuses. Reflector. —These specula, combined with a reflecting concave mirrorperforated in the centre, 7-8 cm. in diameter and of 10-15 cm. focaldistance, allow, with sufficient light, an accurate view to be obtainedof such pathological changes as are perceptible in the membrane ormeatus. For operations on the ear, when both hands are required formanipulation, the mirror should be fixed to the head by Semeledershead-band, to which it is fastened by means of a ball-and-socketjoint in front of the eye of the observer. Each mirror can be soconstructed as to be used with a handle as well as a my practice I use a mirror fixed
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
