Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 304
the intervention of the microscope,and note the effects of opening and closing the slit by rotating thescrew, C (fig. 225) ; the lines can only be well seen when the slit isreduced to a narrow opening. The screw H diminishes the lengthof the slit, and causes the spectrum to be seen as a broad or a… … Fig. 228.—Upper half, map of solar spectrum, showing Fraunhofer lines. Lowerhalf, absorption spectrum, showing position of bands in relation to lines. port wine, madder, and blood are good fluids with which to com-mence this study of absorption bands.2 As each colour varies inrefrangibility, the…
Microscopy
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