Excerpt from The Spectra of Sulphur Dioxide: A Dissertation
The absorption spectrum of sulphur dioxide in the violet and ultra-violet regions was found for pressures of three atmospheres, two atmospheres, and one atmosphere, 1h cm, cm, and cm. The wave-lengths were determined by measurements made on the photographic plates in the usual way. The dividing engine used for this purpose was one by Gaertner, on which readings could be made to mm; that is, to a greater accuracy than settings could be made on the bands. The reduction factor was roughly 32 tenth-meters to 1 mm.
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