Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 360
Fig. 224. … Fig. 225. 346 LIGHT [§§ 576-577 earliest form of the telescope, being first used by Galileo.If two such telescopes are joined together with their axesparallel, an enlarged image of distant objects will beproduced in each eye. Such an apparatus is the ordinaryopera-glass of to-day. 577. The Optical…
Physics
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