Deafness practically illustrated / [James Yearsley].

  • James Yearsley
Date:
[1849]
Catalogue details

Licence: Public Domain Mark

Credit: Deafness practically illustrated / [James Yearsley]. Source: Wellcome Collection.

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    The essential differences between my instrument and those in common use consist in the blades being of equal width throughout their length, and being roughened on the outer surface to the extent of a quarter of an inch. ‘The roughness of the blade is not cognizable to the feelings of the patient; and when applied, they cling so firmly to the sides of the passage with which they come in contact, as to admit not only of its dila- tation, but retractation; and the latter, as already said, I hold to be of more importance than the former. Next to the value of an efficient instrument for the inspection of the auditory passage, is a substitute for the sun’s rays, especially to the London practitioners of aural surgery. Artificial illumination is therefore frequently necessary ; and this is af- forded us very satisfactorily by a com- mon Argand lamp, provided with a reflector and a tube opposite, several inches long, having at each extremity a double convex lens. I have used this lamp or auriscope (as it is sometimes technically called) for several years, and, aided by my
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