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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    circumference of Indigo, half an inch in breadth ; standing at about 8 feet distance, I viewed it through the lower refracting angle, and found that all the red and yellow rays compounding the orange, had fallen below the blue circumference, which was changed into an oblong shape. EXPERIMENT 4th. If we make a hole of any given size in a card, on looking through it at the clouds by means ol the lower refracting angle of the prism, the upper edge appears fringed with red and yellow rays, the lower with blue and violet. This appearance does not arise from any real difference in the upper and lower fringes of,reflected light, for the dark or black light, reflected from the interior circumference, is compounded of the three simple colours; but in passing through the prism, the red and yellow being more refrangible than the blue, either rise above or fall below it, according as the upper or lower refracting angle is used. This