Abstract
A COMPLETE record and discussion of the double-star measures made at the Potsdam Observatory by Prof. Lohse, the director, during the period 1899 to 1908 is given in Publication No. 58 of the Observatory. Prof. Lohse employed a refractor made by Schroeder about twenty-five years ago. The objective is eleven inches, and the flint is dark green. It may be described as a good instrument, but not of the highest quality. Nevertheless, we notice that Prof. Lohse was able to secure measures of some difficult pairs, notably 8 Equulei, K Pegasi, and Sirius. The filar micrometer has. one fixed and one movable thread. Generally the power employed was 550, but occasionally one of 800 was used. The power ordinarily used with the Greenwich 28-inch refractor is 670, and occasionally 1120. Setting out with a definite programme, he chose a working list of 166 double stars made up of known binaries and others of interest, and during the nine years.he was making measures of these systems he collected those made by other observers, and hence was in a position to make a useful discussion of his results.
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References
Publikationen des Astrophysikalischen Observatoriums zu Potsdam, No. 58. Zwanzigsten Bandes, Erstes Stück. Doppelsterne von O. Lohse . (Director). Pp. 168. (Potsdam, 1908; in Kommission bei W. Engelmann in Leipzig.)
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Double-Star Studies1. Nature 81, 492–493 (1909). https://doi.org/10.1038/081492a0
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DOI: https://doi.org/10.1038/081492a0