An elementary course of natural and experimental philosophy .. (1856)
Tate, Thomas, 1807-1888 · Boston, Hickling, Swan and Brown · leaf 169
other, and a double convex eye glass o, the whole being fitted in ametallic tube, a b is the distant object; a1 6l its inverted image, formedby the large concave mirror or speculum S S; this image is again re-flected by the small mirror s, and thus forms the erect image a2 Z>2, whichis magnified… … Fig. 57. the direction of the axis of the tube, (at an angle of 45°,) and a magni-fying lens o placed in the side of the tube. 39. Herschels telescope, represented in Fig. 58, has only one concave
Physics
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