Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 94
ares, such as fig. 58, having sides parallel to the page, which givesthe spectra shown in fig. 59, consisting of vertical rows for thehorizontal lines and horizontal rows for the vertical ones. But itis readily seen that two diagonal rows of spectra exist at right DIFFRACTION EXPERIMENTS 69 angles… … 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.
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