The scientific papers of Sir William Huggins (1909)
Huggins, William, Sir, 1824-1910, Huggins, Lady, d. 1915 · London, W. Wesley and son · leaf 428
hrough the train of prisms,remained approximatively concentric with the object-glass of the telescope Chemical Spectra 599 whilst the latter was moved through an extent of arc equal to the visiblespectrum. All the pencils emerging from the last prism, therefore, with theexception of those of the… … Fig. 48. about 198°. The interval from A to H corresponds to about 21° 14 of arcupon the brass scale. 3. The measuring-part of the apparatus consists of an arc of brass, markedc in the figure, divided to intervals of 15. The distance traversed by thetelescope in passing from one to the other of the…
Astronomy
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