Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 159
ute intermediatecolours, and shades of colours of every description. Whiteness is a peculiar production : it is not com-posed of any particular ray of light, but produced by **a copious reflection and due proportion of the rays ofall sorts of colours. Blackness proceeds from the peculiar quality of… … Let abc represent a glass prism, and e a smallbole in the window-shutter of a darkened room, bywhich the pencil of rays e g enters and falls on theside of the prism at g. If the medium of the glass didnot obstruct the rays, the^ would pass on in a straightline and parallel direction to h, and there…
Physics
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