Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 130
s slipping.At E a diaphragm is fitted as shown. When in use the instru-ment is focussed by sliding the smaller tube in or out until thebest definition is obtained; in order to prevent the tube carry-ing the lens and prism train from turning round and gettingout of alignment with the slitj-a small… … Fig. 40. tube C. This tube, C, is made to slide over the tube B inorder to allow the rays to be focussed upon the slit. Sometimes a photographic scale is added to this instru-ment, the image of which is projected in through a side tubeand viewed by reflection from the last prism face. This,however,…
Spectrum analysis
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