31 
but most so at the extremities where they are strongest ; and they 
are put upon the paper in such a gradation that, however the space 
is confined and the tints consequently innumerable, they may be 
identified by the measures from the centre with the compasses ; and 
so nearly do the different copies correspond with one another, that 
they will pretty well accord with the nicest comparison of which we 
can be sensible. 
The inner triangle commences, as it were, with a tint darker than 
the circumference of the circle above described, and the next or 
middle portion shows the yellow, red, and blue still more determined, 
and the outer triangle, perhaps, most perfect, or what I would wish 
to consider as the fullest and most determined colours which I have 
got pretty well represented. These three divisions are distinct, and 
I call the innermost, light, the next, middle, and the outer, the full 
tint, which may be compared to the upper wedge. Tab. 7. The full 
red may be found at the beginning of the wedge, the middle red 
at about the middle of the second line, and the pale red at the end 
of the third line; when the whole is adjusted, portions of the vellovv 
and blue in the same parts of the wedge will also accord. Thus 
three degrees of the simple or primary tints. These, passing over 
each other at the angles, form binaries ; being atone corner, orange ; 
at another, green ; and at the other purple. Thus light yellow and 
light red form light orange ; middle yellow, and middle red, form 
middle orange : and full yellow, and full red, form full orange ; light 
yellow, and middle red, forming reddish orange, &c. ; in all nine 
distinct tints, and the same with the greens and purples ; for a fuller 
description see the nomenclature to the chromatic scale. 
Now these may form ternaries by adding to them the third co- 
lours, — to the orange blue, to the green n^d, and to the purple yellow ; 
thus are formed the different browns or ternaries, which must al- 
ways consist of the three primaries as the cjiromatometer shows t 
these are innumerable of course, as they may be lighter or darker, 
orange, green, or purple browns, &c. 
The lovver circle c, d. represents t\vo of the three principal browns. 
