DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.62828#0441
a (hade to one that is white, and therefore, in producing a lha-
dow to any thing black or blue, it will require all the force and
ftrength of the Indian ink. The other colours, as green and
yellow, &c. will alfo require a due degree of light and fhade to
diffinguiffi them by.
Mr. Kirby confiders the colours receding from white to
black in the following order: z. e. yellow after white, then
green, red, blue, and black, fucceffively. It is difficult, how-
ever, to diffinguiffi fome of thefe by the effect of Indian ink,
yet it is evident fbmething may be done towards it. Thus: the
cube W is fuppofed to be white, Y yellow, G green, R red, B
blue, and BL black*.
Of the Proportion of *Tmts fuited to ObjeHs at different Difiances in
the fame Picture. See a View, Plate XXVI.
It is evident, from the nature of perfpedive in general,
that not only the proper dimenlions of objeds, but alfo the de-
gree of tint, is effential in making them appear at different dif-
* This is not the order of the fimple colours, according to Sir Ifaac Newton’s theory
of their origin. His theory informs us, that when the rays of light are feparated by the re-
fraction of a prifm, the firfl: will be red, then orange, yellow, green, blue, indico, and
violet, fucceffively. See his Optics, Book I. Prop. 6. According to this, white is not a
fimple colour, but a compound or mixture of all that are fimple, and black a total privation
of every colour,
tances.
dow to any thing black or blue, it will require all the force and
ftrength of the Indian ink. The other colours, as green and
yellow, &c. will alfo require a due degree of light and fhade to
diffinguiffi them by.
Mr. Kirby confiders the colours receding from white to
black in the following order: z. e. yellow after white, then
green, red, blue, and black, fucceffively. It is difficult, how-
ever, to diffinguiffi fome of thefe by the effect of Indian ink,
yet it is evident fbmething may be done towards it. Thus: the
cube W is fuppofed to be white, Y yellow, G green, R red, B
blue, and BL black*.
Of the Proportion of *Tmts fuited to ObjeHs at different Difiances in
the fame Picture. See a View, Plate XXVI.
It is evident, from the nature of perfpedive in general,
that not only the proper dimenlions of objeds, but alfo the de-
gree of tint, is effential in making them appear at different dif-
* This is not the order of the fimple colours, according to Sir Ifaac Newton’s theory
of their origin. His theory informs us, that when the rays of light are feparated by the re-
fraction of a prifm, the firfl: will be red, then orange, yellow, green, blue, indico, and
violet, fucceffively. See his Optics, Book I. Prop. 6. According to this, white is not a
fimple colour, but a compound or mixture of all that are fimple, and black a total privation
of every colour,
tances.