29 
continue as long as their respective parallels or breadths along the 
productor: the red should be perfect and will become more dilute 
and a})proach crimson, as it gets to the narrow end of the first seg- 
ment, the yellow and blue will diminish in proportion, or appear 
more dilute. The beginning of the second segment will have crim- 
son in the place of the red, which will be paler at the end ; the yel- 
lows and blues diminish of course. The third segment will have a 
middle crimson or a crimson more dilute, as also the yellow and 
blue. The fourth segment will have light crimson with light yel- 
lows and blues. The fifth segment will have pinks or paler crim- 
sons, yellows, and blues till they all fade into light, 
THE UNIVERSAL CHROMATOMER, Tab. 7. lowerjig. 
This is formed of segments of the wedge, parallelized in certain pro- 
portions, and which may be called indicators and determinators *. 
Tiiey are brought near to each other to mix and form the binaries 
and ternaries. 
The narrow end of the upper determinator gives the proportions 
of yellows, reds, and blues, according to its respective width, and so 
to the middle with some violet. The two next segments give also 
the same proportions of colour as the upper wedge ; but, according 
to the proportionate distance exemplified in Tab. 3. and 4., mix with 
the next determinators immediately under them forming light to 
darker greens. The second five segments form chiefly light blues 
and light to denser crimsons. Between the second and -third sets 
of determinators will be found verdigrease-Iike greens. The third 
determinator will have light and dark browns ; between it and the 
fourth will be light and dark grays at the broader end. The fourth 
and fifth will produce pinks, light brownish orange to nearly orange 
at the broadest end. As every determinator gives its exact propor- 
* Indicators, when they are competent to show the tint or colour indicated by the 
comparative proportions : thus, as sir Joshua Reynolds says, " Theory is the art of 
knowing what is truly Nature." Determinators, when with the help of tlie prism we 
can determine the proportions. 
