Experimental outlines, for a new theory of colours, light and vision : with critical remarks, on Sir Isaac Newton's opinions, and some new experiments on radiant caloric / by Joseph Reade, M.D.

  • Reade, Joseph.
Date:
1816
Catalogue details

Licence: Public Domain Mark

Credit: Experimental outlines, for a new theory of colours, light and vision : with critical remarks, on Sir Isaac Newton's opinions, and some new experiments on radiant caloric / by Joseph Reade, M.D. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    G a 5, two beams of light, impinge on the plane C G, passing through without decomposition. The opaque angles C G, transmit dark rays which passing through the prism, are separated into blue, red and yellow.' 1, 2, 3,—5, 6, 7. these intermix and form the spectrum as al- ready described. Now it is evident from these diagrams, that yellow rays are the most refran- gible, and blue the least; for if we produce a straight line from G to F, the blue rays No. I, and 5, are nearest the perpendicular, and conse- quently the least refrangible, and the yellow rays No. 3, and 7, are the farthest from the perpen- dicular, and therefore the most refrangible. The following diagram represents a prism in the open sun-beams, forming both a de- scending and ascending spectrum.