Newton's sketch of his crucial experiment (experimentum crucis) in which light from the sun is refracted through a prism. One color is then refracted through a second prism to show that it undergoes no further change. Light is then shown to be composed of the colors refracted in the second prisms.

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Image reproduced by permission of the Warden and Fellows, New College, Oxford

John Faurel, ed., et al. Let Newton Be? A new perspective on his life and works
New York: Oxford University Press, 1988, pg 87
call number: QC16 N7L47 1988

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