An improved ophthalmoscope / [Henry Rosborough Swanzy].

  • Swanzy, Henry Rosborough.
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: An improved ophthalmoscope / [Henry Rosborough Swanzy]. Source: Wellcome Collection.

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    Swanzy / Prescott's Improved Ophthalmoscope. in another drawing, fits, as each nick or countersink is brought opposite to said catch. B shews the disc with lenses a1 and countersinking hl in section. Fig. 2 shews the intermediate plate C with the opening f through which the ophthalmoscopist looks, a boss d on which the disc with lens may be rotated, and the simple projecting pin e to act as a catch in the countersinks or nicks of the lens 5 disc. G the screw for attachment to the handle of the instrument. H, Fig. 2, shews the intermediate plate in section d1 the boss, /1 the opening, el the simple projecting pin which acts as a catch. gl the screw for the handle. Fig. 3 shews the intermediate plate D with the rotatable disc placed in its proper position B on the boss d and held there by the screw C, / shewing the relative 10 positions of each lens and the hole in the intermediate plate. Fig. 4 shews, also in section, the whole instrument put together, D the plate already referred to, B the disc with lenses, C the concave mirror and the plane one, both cemented back to back to an intermediate plate, E, in the drawing the plane reflecting surface is next the intermediate plate, and f the hole through 15 the intermediate plate and mirrors, and one of the lenses in the disc opposite said hole. Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed we declare that what we claim is, 20 An improved ophthalmoscope substantially as described. Hated this 28th day of September 1893. HENRY ROSBOROUGH SWANZY. GEORGE PRESCOTT.