Sheraton, Thomas; Bensley, Thomas; Mathews, James; Bensley, Thomas [Bearb.]; Mathews, James [Bearb.]; Terry, George [Bearb.]; Jordan, Jeremiah Samuel [Bearb.]; Wayland, L. [Bearb.]: The Cabinet-Maker And Upholsterer's Drawing-Book: In Three Parts (London: Printed For The Author, By T. Bensley; And Sold By J. Mathews ... C. Terry ... J.S. Jordan ... L. Wayland ... And By The Author, 1793)

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SECTION II.
Lbe Affinity and Agreement between Optical Laws and the Prin-
ciples of Perfpe Alive demonflrated—And alfo of tbe Ufe of tbe
three principal Elementary Planes in tbe Praclice of Draw-
ing—-fbowing, that all that is exhibited by the natural Pofitions
of tbefe Planes in Fig. z, may be correctly drawn on any even
Surface without their Aid.—Of tbe various Pofitions of Lines
and Planes to the PiAlure, and of the Principles of Fanifhing
Points agreeing therewith..

Of the Affinity of Optical Laws with the Principles of P erfpeAlive.
In Section I. page 183, it has been fhown that all objects
appear proportionably lefs as they are farther removed from
the eye; and as the reader is now fuppofed to be acquainted
with the planes, lines, points, and terms, which have been ex-
plained in the preceding fedtion, I fhall proceed to fhow that,
the rules of perfpedtive agree with optical laws»
Thus:.