The Boston school compendium of natural and experimental philosophy .. (1837)
Parker, Richard Green, 1798-1869 · Boston : Marsh, Capen & Lyon · leaf 150
ber that fits theeye, the purchaser can generallybe accommodated without the trouble of tryingmany glasses What glasses are used when the eve is too flat I What are used when the eyeis too round ? 363. Of what is the eye composed ? 264. What are the differentparts of the eye? First? Second? Third… … !40 NATURAL PHILOSOPHY. tal of a watch is set in the case. Its degree of convexity varies indifferent individuals and in different periods of life. As it coversthe pupil and the iris, it protects thern from injury. Its principaloffice is to cause the light which reaches the eye, to converge to…
Physics
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