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Download pdf Report of the Meeting Volume 20

نویسنده : Scott Kaul یکشنبه 28 تیر 1394 04:20 ب.ظ  •   

Report of the Meeting Volume 20 by British Association for Science

Report of the Meeting Volume 20
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Author: British Association for Science
Number of Pages: 346 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781231033920
File size: 15 Mb
File Name: Report.of.the.Meeting.Volume.20.pdf
Download Link: Report of the Meeting Volume 20
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1851 Excerpt: ...third place, the observer having satisfied himself on the two previous points, will carefully examine the moon's limb all round, and may now record, on the previously prepared circular diagram, the positions of any such prominences round the moon's limb. Let this be done in the first instance without regard to their form or size, but only with regard to their distribution round the circle; and let this he carefully verified once at least. Let him note whether any kind of arch of light connects two or more of the prominences. 4. Let the dimensions and forms of the prominences be studied. For the former purpose reference should be made to the two parallel threads in the eye-piece of the telescope. For the latter, observe--Whether the prominences have hard and permanent, or waving and ill-defined outlines. Whether they are invariably broadest at the base, and have on the whole a tapering shape. Whether they seem to stand erect, or whether any or all of them are aslant, like teeth on the edge of a circular saw. Whether any of them taper inwards next the dark limb of the moon: whether they appear isolated; and, if so, how the space between the red patch and the moon's limb is occupied. Whether the prominences vary in outline during the scrutiny. Whether any appear to grow up or to diminish; and, if so, whether such change is what the moon's motion would naturally account for. 5. Let the illumination of the prominences be studied. First, as to general colour; by inspecting them with the undefended eye, both with and without a telescope (without any dark glass). Next, as to distribution of colour, select a well-defined prominence and examine it all over repeatedly with a considerable magnifying power, and observe if it appears absolutely uniform in colour and brig...

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