. Bulletin. Science. CALIFORNIA ACADEMY OF SCIENCES. 339 BLACK TRANSITS OF JUPITER'S SATELLITES m AND IV. BY PEOF. GEO. DAVIDSON. At the meeting of March 3d, 1884, the President called attention to the observation of the black transit of the III and IV Satellites of Jupiter, made by Messrs. Burckhalter and Hill, and himself. The paper was accompanied by his drawings to exhibit the phenomena. The first observation was upon the transit of the III Sat- ellite, and its shadow over the disk of the planet, on the 15th of January, at 9 hr. 01 m., local mean time, by Profes- sor Davidson. It is illust
. Bulletin. Science. CALIFORNIA ACADEMY OF SCIENCES. 339 BLACK TRANSITS OF JUPITER'S SATELLITES m AND IV. BY PEOF. GEO. DAVIDSON. At the meeting of March 3d, 1884, the President called attention to the observation of the black transit of the III and IV Satellites of Jupiter, made by Messrs. Burckhalter and Hill, and himself. The paper was accompanied by his drawings to exhibit the phenomena. The first observation was upon the transit of the III Sat- ellite, and its shadow over the disk of the planet, on the 15th of January, at 9 hr. 01 m., local mean time, by Profes- sor Davidson. It is illustrated in Fig. 1, wherein the small dark disk is the shadow of the satellite with the partially dark image of the satellite itself three or four diameters to the right. The figure gives the appearance of the planet, etc., as seen with the inverting Fig. I—Jan. 15, 1884—Jupiter at 17h. 11m. G. M. T. When it was examined with powers of 120 to 150 diame- ters, the image of the satellite itself showed nearly as dark as the shadow, but not quite so large. After making the first drawing, the atmosphere was steady enough to admit using 255 diameters. This was 12 minutes later, and then the satellite was seen as a circle with a segment of two-thirds of the disk bright white, and the other segment of one-third. 12. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original California Academy of Sciences. San Francisco
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