A text-book of the diseases of the ear for students and practitioners . Fig. 341. Fig. 342. Kugel has also recently demonstrated by experiments that asimple groove, is still more serviceable in many cases than thevariously constructed hearing-trumpets. This instrument, whichdiffers considerably from the appliances thus far described, con-sists of a hollow cylinder 10-15 cm. in diameter and 25-30 length, from the wall of which a portion is cut out, involvingabout one-third of its entire length in the direction of its longaxis. The open groove thus formed is turned up at its upperextremity
A text-book of the diseases of the ear for students and practitioners . Fig. 341. Fig. 342. Kugel has also recently demonstrated by experiments that asimple groove, is still more serviceable in many cases than thevariously constructed hearing-trumpets. This instrument, whichdiffers considerably from the appliances thus far described, con-sists of a hollow cylinder 10-15 cm. in diameter and 25-30 length, from the wall of which a portion is cut out, involvingabout one-third of its entire length in the direction of its longaxis. The open groove thus formed is turned up at its upperextremity to such an extent that this portion—about the sizeof the palm of the hand—is placed against the posteriorsurface of the auricle, thereby almost surrounding it. The * Wien. vied. Wochenschr., 1898 and 1899t It can be obtained at Reiners in Vienna. INSTRUMENTS TO AID THE HEARING 839 action of this instrument, which is free from secondary noises,should, according to Kugel, be very satisfactory. The so-called otophones have proved of little value. Theyconsist of two
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectear, booksubjecteardi
