The laryngoscope : directions for its use, and practical illustrations of its value in the diagnosis and treatment of diseases of the throat and nose : two lectures delivered at the Royal College of Physicians / by George Johnson.

  • George Johnson
Date:
1864
Catalogue details

Licence: Public Domain Mark

Credit: The laryngoscope : directions for its use, and practical illustrations of its value in the diagnosis and treatment of diseases of the throat and nose : two lectures delivered at the Royal College of Physicians / by George Johnson. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    41/66 page 39
    iuconvenient restriction of tiie field of vision and the facility of observing, which may probably have arisen from the mechanical imitation of the practice of oph- thalmoscopy, without suf&cient consideration of the peculiar optical difficulties which exist in the latter art. “It matters nothing (optically) for laryngoscopy whether the hght be direct or reflected, and the light of a lamp concentrated through a lens answers per- fectly well without any reflection. The laryngeal mirrors are, of course, necessary to deflect the rays into the tube of the larynx.” V
    digitised image 1
    digitised image 2
    digitised image 3