Newall, H. F · London : Society for Promoting Christian Knowledge · leaf 158
us an image of the verticalslit can be seen if light is allowed to pass throughthe slit and collimator. The grating is now insertedbetween the object-glasses of collimator and telescope,and is fixed there in a vertical position with thewires or ruled lines parallel to the slit. Means areprovided… … Fig. 57. 148 THE SPECTROSCOPE AND ITS WORK [CHAP. flanked by narrow fainter images symmetrically placedon either side. If the grating is very closely ruled,it may be necessary, in order that the lateralimages may be seen, to turn the telescope to oneside or the other through a considerable…
Spectroscope · Spectrum analysis
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