Reports on observations of the total eclipse of the sun, August 7, 1869; conducted under the direction of Commodore B.F. Sands, U.S.N., Superintendent

ISBN 10: 123642638X / ISBN 13: 9781236426383
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Reports on observations of the total eclipse of the sun, August 7, 1869; conducted under the direction of Commodore B.F. Sands, U.S.N., Superintendent. N° de ref. de la librería

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Sinopsis: 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. 1869 Excerpt: ...and afternoon, and every half and whole hour during the middle of the day. Although from the comparatively rude character of the method of observation the results obtained can only be considered as rough approximations to the truth, yet they are sufficiently accurate for the purposes of a practical photographer in estimating lengths of exposure for negatives, and possess, it is believed, so far as they go, a peculiar value on account of the unusually cloudless skies and equable condition of the atmosphere in that splendid Iowa climate during the period through which the observations extended. A table of the results of the observations is accordingly given in Schedule B. Though for the sake of avoiding error as far as possible the slips of each day were invariably compared with the noon shade of the same day as the standard, yet these midday slips have been found to differ so very slightly from each other--in most cases not A general mean of observations of this character, made on seven different days at or near the time at which totality would occur, gave for the sun's actinic force at that period 0.374, the chemical intensity at noon being taken as 1.000. But since a collodion plate is probably not so sensitive to a diminution of chemical force in the light as silvered paper, I considered it safe to estimate that on account of the time of day at which totality would occur, the calculated exposure should be just doubled. The difference in time of year and latitude between De La Rue and myself on the occasion of the two eclipses being too inconsiderable to affect the question of length of exposure, I thus obtained twenty-three seconds as the equivalent with my telescope of the one-minute exposure given by that astronomer. With this estimate I had to allow on...

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Título: Reports on observations of the total eclipse...
Condición del libro: Good

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Sands, B. F.
Editorial: ReInk Books (2017)
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Descripción ReInk Books, 2017. SoftCover. Estado de conservación: New. Reprinted from 1869 edition. NO changes have been made to the original text. This is NOT a retyped or an ocr'd reprint. Illustrations, Index, if any, are included in black and white. Each page is checked manually before printing. As this reprint is from very old book, there could be some missing or flawed pages, but we always try to make the book as complete as possible. Fold-outs, if any, are not part of the book. If the original book was published in multiple volumes then this reprint is of only one volume, not the whole set. This paperback book is SEWN, where the book block is actually sewn (smythe sewn/section sewn) with thread before binding which results in a more durable type of paperback binding. It can also be open wide. The pages will not fall out and will be around for a lot longer than normal paperbacks. This print on demand book is printed on high quality acid-free paper. Nº de ref. de la librería 454692730

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Editorial: Palala Press, United States (2015)
ISBN 10: 1354199332 ISBN 13: 9781354199336
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Descripción Palala Press, United States, 2015. Hardback. Estado de conservación: New. 234 x 156 mm. Language: English . Brand New Book ***** Print on Demand *****.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant. Nº de ref. de la librería APC9781354199336

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Editorial: Palala Press, United States (2015)
ISBN 10: 1354199332 ISBN 13: 9781354199336
Nuevos Tapa dura Cantidad: 10
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Descripción Palala Press, United States, 2015. Hardback. Estado de conservación: New. 234 x 156 mm. Language: English . Brand New Book ***** Print on Demand *****. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant. Nº de ref. de la librería APC9781354199336

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ISBN 10: 1286687020 ISBN 13: 9781286687024
Usado Cantidad: 1
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Descripción Estado de conservación: Good. Reports On Observations Of The Total Eclipse Of The Sun, August 7, 1869: Conducted Under The Direction Of Commodore B. F. Sands, U. S. N., Superintendent . Nº de ref. de la librería Grb2749706

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Simon Newcomb
ISBN 10: 1173816836 ISBN 13: 9781173816834
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Descripción Estado de conservación: Brand New. Book Condition: Brand New. Nº de ref. de la librería 97811738168341.0

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