A New Elucidation of Colours Original Prismatic And Material Showing Their

Cover A New Elucidation of Colours Original Prismatic And Material Showing Their
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By use we may afterwards readily compare them, by moving the prism.
The wedge or open chromatometer. Tab. "J. Upper Jig. The square at the beginning will indicate the proper distance, by giving the spectator eight divisions or tints of regular and equal propor- tions, viz.
1 Light Blue apparently above the black space.
2 Darker Blue 3 Violet 4 Blue Black \ upon the black space.
5 Black 6 Scarlet \ below the black space. 8 Lighter YellowJ ^ A broader square wiU not give more divisions of colours
... either regular or otherwise, if observed either at the same or at a less distance.
The commencement of the wedge should give two parts of blue, one of indigo, one of violet, one of red, and two of yellow, nearly as Tab. 3. I. Or as Tab. A. D. The dark blue, indigo, and violet will 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.


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