Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 135
ind the focus ofthe object-glass, which makes it superior to others ininstruments of precision, as we shall presently see. It must be remembered that these eyepieces give aninverted image—or rather the object glass gives an in-verted image, and the eyepiece does not right it again ;but there are… … Fig. 62.—Eamsdens Eyei^iece. telescope, a is the object-glass, a h the image invertedin the usual way; B is an ordinary convex lens sendingthe rays from a and h parallel. Now, instead of placingthe eye at c, as in the ordinary manner, another smalllens, acting as an object-glass, is placed in the…
Astronomy · Telescopes
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