Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 368
lenses, the object-glass and the eye-glass. An inverted image of an object, as a star, is produced by the object-glass, and magnified by the eye-glass. Fig. 297 represents the principle of constructionof the astronomical refracting telescope. 0 is an object-glass placed at the end of a tube, which…
Physics · Science · Technology
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