Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 138
ble, and the spectrum is made to pass along in front ofthe observer by rotating the prism train. In this type may beincluded the Littrow instrument, in which the principle ofauto-coUimation is adopted, that is to say, the same tube servesfor both collimator and telescope. The simplest form of… … right angles to one another. The constant deviation prism ismounted upon a table which can be rotated by a tangent screwj THE COMPLETE PRISM SPECTROSCOPE 123 and in this way, as follows from the construction of the prism,the rays seen through the telescope are always those whichtraverse the prism…
Spectrum analysis
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