Doubts concerning the inversion of objects on the retina / by Marmaduke Berdoe.

  • Marmaduke Berdoe
Date:
1772
Catalogue details

Licence: Public Domain Mark

Credit: Doubts concerning the inversion of objects on the retina / by Marmaduke Berdoe. Source: Wellcome Collection.

    23/98 (page 19)
    [ ‘9 ] have ceafed their purfuits. But I have al¬ lured myfelf that very little certainty of inverfion of objecls in the eye ought to be taken from this experiment, for the a * fame phenomena will conilantly fucceed from the application of a imiple convex lens, or a glafs globe filled with water, or in¬ deed any tranfparent fpherical ohje6f, whofe convexity collects a greater-number of rays 1 of light than the fame diameter could were it a plane furface. Should the rays of light pafs into a dark room, thro5 a fmall aperture before which a convex lens is placed, the objects will ceafe to appear on the walls, but will paint themfeives on a paper at a * _ * fmall diflance from the lens in the fame inverted fituation. Place at a proper dif¬ iance from its focus a lens of the fame form and diameter, and the obje61s will difappear on the paper, but will prefent themfeives to the eye of the fpe£lator that looks thro' the kits in their natural fituation. ;€ % 'Suopofe / r