LETTER XCVIII. On Distinctness in the Expression: On the Space of Diffusion Occasioned by the Aperture of Object-glasses, and Considered as the First Source of Want of Distinctness in the Representation.
LETTER XCVIII. On Distinctness in the Expression: On the Space of Diffusion Occasioned by the Aperture of Object-glasses, and Considered as the First Source of Want of Distinctness in the Representation.