Francis Hauksbee: illustration of lenses and the rainbow
Francis Hauksbee was the demonstrator for the Royal Society during the early years of Newton's tenure as president. The engraving is from his book, Physico-mechanical experiments on various subjects : containing an account of several surprizing phenomena touching light and electricity, producible on the attrition of bodies : with many other remarkable appearances, not before observ'd, together with the explanations of all the machines, (the figures of which are curiously engrav'd on copper) and other apparatus us'd in making the experiments.
Newton; Whiston; Desaguliers
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