Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 94
Fig. 58. xc 0 fo 0 0 O o\ 0 0 0 O 0 V Q 0 O 0 7 Fig. 59. allowing only the diagonal ones to pass to the eye-piece, that thevertical and horizontal lines have disappeared, and two new sets oflines at right angles to the diagonals in their place.
Microscopy
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