Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 216
Fig. 145. Wright for a finder. The eye-pieces were provided with rings, likePowell and Lealands, outside the tube to govern the depth whicheach should slide into the draw-tube, by which means the diaphragmis in the same place whatever the depth of the eye-piece employed,
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