Sir, To perform my late promise to you, I shall without further ceremony acquaint you, that in the beginning of the Year 1666 (at which time I applyed my self to the grinding of Optick glasses of other figures than Spherical ,) I procured me a Triangular glass-Prisme, to try therewith the celebrated Phœnomena of Colours .
CITATION STYLE
Newton, I. (1672). A letter of Mr. Isaac Newton, Professor of the Mathematicks in the University of Cambridge; containing his new theory about light and colors: sent by the author to the publisher from Cambridge, Febr. 6. 1671/72; in order to be communicated to the R. Society. Philosophical Transactions of the Royal Society of London, 6(80), 3075–3087. https://doi.org/10.1098/rstl.1671.0072
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