Observations on Encke's Comet at the Darmouth College Observatory

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Abstract
THE spectrum of this comet was observed on Dec. 1st, 2d, 5th and 6th, and found to consist of three bright bands, of which the central one is by far the most conspicuous.The bands are pretty sharply defined at their lower (i.e., less refrangible) edge, but fade gradually toward their upper limit.There was no indication of resolvability into lines, but the light was too feeble to allow the use of gren,t dispersive power, or of a very narrow slit.I think that with the power and adjustment employed, no lines nearer to each other than b i and b iv could have been distinctly separated.No continuous spectrum could be detected, nor anydjfference, except in brightness, between the spectra of different portions of the comet.After trying several arrangements, with dispersive powers ranging from one to five prisms, it wa.sfound that the best results were obtained with a chemical spectroscope having a single 60° prism, and collimator and telescope of such power and focal length as just neatly to divide the D lines.In this instrument the eye-piece is provided with a bar crossing the center of the field of view parallel to the slit, while the telescope it.'lelfcan be moved by a tangent screw so as to bring any portion of the spectrum to the edge of the bar.There is also the ordinary scale viewed by reflection from the surface of the prism.The observations were made in the following manner: By means of the tangent screw, the bar -was so placed as to hide
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Authors C. A. Young
Journal american journal of science
Year 1872
DOI
10.2475/ajs.s3-3.14.81
URL
https://doi.org/10.2475/ajs.s3-3.14.81
Keywords Keywords not found

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