Astronomical Register: A Medium of Communication for Amateur Observers and All Others Interested in the Science of Astronomy, Volume 7

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J. D. Potter., 1870
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Page 121 - Treutler were balloted for and duly elected Fellows of the Society. The following papers were read : — 1. " Thermometric Observations on Board the Cunard RMSS Algeria,
Page 244 - A, was finished at 1 lh 5m, the height of the prominence being 1' 5", or about 27,000 miles. I left the Observatory for a few minutes; and on returning, at llh 15m, I was astonished to find that part of the prominence A had entirely disappeared ; not even the slightest rack appeared in its place : whether it was entirely dissipated, or whether parts of it had been wafted towards the other part, I do not know, although I think the latter explanation the more probable one, as the other part had increased.
Page 196 - According to this hypothesis. the photosphere itself is either solid or liquid, and it is surrounded by an atmosphere composed of gases and the vapours of the substances incandescent in the photosphere. We find, however, instead of this compound atmosphere, one...
Page 244 - ... or rapid dissipation, the uprush and dissipation representing the birth and death of a prominence. As a rule, the attachment to the chromosphere is narrow and is not often single ; higher up, the stems, so to speak, intertwine, and the prominence expands and soars upward until it is lost in delicate filaments, which are carried away in floating masses.
Page 254 - The spot-spectrum was very narrow, as the spot itself was so greatly foreshortened ; but the spectrum of the chromosphere showed me that the whole adjacent limb was covered with prominences of various heights all blended together. Further, the prominences seemed fed, so to speak, from, apparently, the preceding edge of the spot ; for both C, F, and the line near D, were magnificently bright on tlie sun itself, the latter especially striking me with its thickness and brilliancy.
Page 190 - Report of the Astronomer Royal to the Board of Visitors of the Royal Observatory, Greenwich, read at the Annual Visitation of the Royal Observatory, 1860, June 2; and Address of the Astronomer Royal to the Board of Visitors, 1860, May 12.
Page 211 - ... materials. The lines of magnesium extended perhaps one-sixth of the height of the F line, barium a little less, and sodium least of all. We have, then, the following facts : — I.
Page 89 - Investigation of the Distance of the Sun and of the Elements which depend upon it, from the Observations of Mars made during the Opposition of 1862, and from other Sources.
Page 195 - F line were phenomena depending upon and vindicating varying pressures, we were in a position to determ1ne the atmospheric pressure operating in a prominence, in which the red and green lines are nearly of equal width, and in the chromosphere, through which the green line gradually expands as the Sun is approached...
Page 244 - At 10h 50m, when the action was slackening, I opened the slit ; I saw at once that the dense appearance had all disappeared, and cloud-like filaments had taken its place. The first sketch, embracing an irregular prominence with a long perfectly straight one, which I called A, was finished at 1 lh 5m, the height of the prominence being 1

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