Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 124
e mirror, unless anaperture were made in the large mirror of the size ofthe small one through which the rays could pass andbe rendered parallel by means of an eyepiece placedjust behind the large mirror. So that towards theobject is the small mirror c, and there is an eyepiece E,which enables the… … Fia. 54.—Reflecting Telescope (Gregorian). science of the last century) altered the position of thesmall mirror with reference to the focus of the large one,by sliding it along the tube by a screw arrangement,F, and so was enabled to focus both near and distantobjects without altering the eyepiece.…
Astronomy · Telescopes
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