Mathematical elements of natural philosophy, confirm'd by experiments : or, An introduction to Sir Isaac Newton's philosophy (1747)
Gravesande, Willem Jacob 's, 1688-1742, Desaguliers, J. T. (John Theophilus), 1683-1744, tr, Adams, John, 1735-1826, former owner. BRL, John Adams Library (Boston Public Library) BRL · London : Printed for W. Innys, T. Longman and T. Shewell, C. Hitch ..., and M. Senex ... · leaf 332
red upon the white Plane j allthe Rays, which are of no Ufe to make the Reprefentation, areintercepted by the Ring i> l>, that they may not enter into theChamber and make the Pidure lefs vivid. This Ring alfo inter-cepts the Rays, whereby one Point would be more enlightend thaaanother, by… … Chap. 18. of Natural Philofophy. 235 Experiment 2. A Speftacle like that which we had in the firfl Experiment, is 3440,more conveniently and more diftindlly reprefented in the Day Time,if the painted Figures be enlightend by Rays of the Sun. A thick board H is applied to a Window, which flops a…
Physics · Natural Sciences
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