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 370
he rays of light, in acommon spy-glass, are represented in Fig. 299. 0 is the object-glass, and CL M the eye-glasses, placed at distances from each other equal to double theirfocal length. The progress of the rays through the object-glass, 0, and thofirst eye-glass, C, is tho same as in tho… … Fig. 300,
Physics · Science · Technology
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