Observations of eclipses of the satellit
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D. P. Todd
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Article
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1878
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John Wiley and Sons
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English
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Focal length 390 inches. (2) Two of the 6 inch Transit-of-Venus Equatorials, the apertures of which were generally reduced to 4 inches. These instruments have a focal lengtli of 72 inches. (3) The observation of 1876, February 2 was made with the 4 inch comet-seeker of the Observatory. Focal leng