Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 217
pe in existence, that of the late LordRosse, is made after this pattern. So also is the magnifi-cent instrument belonging to Mr. A. A. Common, at Eal-ing, England. This last, which is probably the mostpowerful telescope in the world, has a reflector of glasscoated with silver, thirty seven and a… … Fig. 242. and an eye piece. Both are achromatic in all good instruments.The object glass forms an inverted, diminished image between itsprincipal focus and the eye piece, but much brighter than the ob-ject itself. The eye piece N then maguifies this image and makesit appear of the dimentions of a…
Physics
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