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
Usado / Cantidad: 0
Disponible en otras librerías
Ver todos  los ejemplares de este libro

Sobre el libro

Lamentablemente este ejemplar en específico ya no está disponible. A continuación, le mostramos una lista de copias similares de 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.

Descripción:

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

Sobre este título:

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...

"Sobre este título" puede pertenecer a otra edición de este libro.

Detalles bibliográficos

Título: Reports on observations of the total eclipse...



Condición del libro: Good

Los mejores resultados en AbeBooks

1.

Sands, B. F.
Editorial: ReInk Books (2016)
Nuevos Paperback Cantidad: 10
Impresión bajo demanda
Valoración
[?]

Descripción ReInk Books, 2016. Paperback. Estado de conservación: New. Reprinted from 1869 edition. NO changes have been made to the original text. 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 than this reprint is of only one volume, not the whole set. This paperback book is SEWN perfect bound, 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 book is printed on demand on acid-free paper. Nº de ref. de la librería 454692730

Más información sobre esta librería | Hacer una pregunta a la librería

Comprar nuevo
EUR 16,78
Convertir moneda

Añadir al carrito

Gastos de envío: GRATIS
De India a Estados Unidos de America
Destinos, gastos y plazos de envío

2.

United States Naval Observatory
Editorial: Palala Press (2016)
ISBN 10: 1354199332 ISBN 13: 9781354199336
Nuevos Paperback Cantidad: 1
Impresión bajo demanda
Librería
Ria Christie Collections
(Uxbridge, Reino Unido)
Valoración
[?]

Descripción Palala Press, 2016. Paperback. Estado de conservación: New. PRINT ON DEMAND Book; New; Publication Year 2016; Not Signed; Fast Shipping from the UK. No. book. Nº de ref. de la librería ria9781354199336_lsuk

Más información sobre esta librería | Hacer una pregunta a la librería

Comprar nuevo
EUR 30,48
Convertir moneda

Añadir al carrito

Gastos de envío: EUR 3,89
De Reino Unido a Estados Unidos de America
Destinos, gastos y plazos de envío

3.

B F Sands
Editorial: Rarebooksclub.com, United States (2012)
ISBN 10: 1130643255 ISBN 13: 9781130643251
Nuevos Paperback Cantidad: 10
Impresión bajo demanda
Librería
The Book Depository US
(London, Reino Unido)
Valoración
[?]

Descripción Rarebooksclub.com, United States, 2012. Paperback. Estado de conservación: New. 246 x 189 mm. Language: English . Brand New Book ***** Print on Demand *****. 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: .in order properly to interpret the results of the photo-chemical observations, and had reached the same conclusions that Professors Bunsen and Koscoe had previously arrived at, unconsciously verifying, by a different experiment, the law of this relation discovered by them and thus announced: (Phil. Trans., 1863, p. 145.) Equal products of the intensity of the light into the time of insolation, correspond, within very wide limits, to equal shades of darkness produced on chloride-of-silver paper of uniform sensitiveness. My plan of experimenting on this subject was rough and simple, like that of the other actinomctrical observations, but quite effective. A sensitized paper strip was first exposed at noon in the precise manner described above in the text, different spaces on the strip receiving different lengths of exposure, and care being taken that the surface of the paper should be exactly at right angles to the course of the solar beam. Immediately af1erwards a second strip was exposed, the board to which it was tacked being, in this case, inclined to the direction of the sun8s rays at such an angle that the shadow of a strip of cardboard projecting from the face of a box previously carefully adjusted so as to exactly face the sun, should, when falling upon the board immediately under it, measure twice the actual width of the cardboard itself. Under these circumstances each space of this sensitized strip received, of course, but one-half the amount of sunlight that impinged upon those of the first strip, and a comparison of the two strips showed that in all cases double the length of exposure was required on the second strip to produce degrees of blackening identical with the shades of the first. The actinomctrical experiments described in the . Nº de ref. de la librería APC9781130643251

Más información sobre esta librería | Hacer una pregunta a la librería

Comprar nuevo
EUR 34,02
Convertir moneda

Añadir al carrito

Gastos de envío: GRATIS
De Reino Unido a Estados Unidos de America
Destinos, gastos y plazos de envío

4.

Editorial: Palala Press, United States (2015)
ISBN 10: 1354199332 ISBN 13: 9781354199336
Nuevos Tapa dura Cantidad: 10
Impresión bajo demanda
Librería
The Book Depository US
(London, Reino Unido)
Valoración
[?]

Descripción Palala Press, United States, 2015. Hardback. Estado de conservación: New. 234 x 156 mm. Language: N/A. Brand New Book ***** Print on Demand *****. Nº de ref. de la librería APC9781354199336

Más información sobre esta librería | Hacer una pregunta a la librería

Comprar nuevo
EUR 34,79
Convertir moneda

Añadir al carrito

Gastos de envío: GRATIS
De Reino Unido a Estados Unidos de America
Destinos, gastos y plazos de envío

5.

Editorial: Palala Press, United States (2015)
ISBN 10: 1354199332 ISBN 13: 9781354199336
Nuevos Tapa dura Cantidad: 10
Impresión bajo demanda
Librería
The Book Depository
(London, Reino Unido)
Valoración
[?]

Descripción Palala Press, United States, 2015. Hardback. Estado de conservación: New. 234 x 156 mm. Language: N/A. Brand New Book ***** Print on Demand *****. Nº de ref. de la librería APC9781354199336

Más información sobre esta librería | Hacer una pregunta a la librería

Comprar nuevo
EUR 35,40
Convertir moneda

Añadir al carrito

Gastos de envío: GRATIS
De Reino Unido a Estados Unidos de America
Destinos, gastos y plazos de envío

6.

B F Sands
Editorial: Rarebooksclub.com, United States (2012)
ISBN 10: 1130643255 ISBN 13: 9781130643251
Nuevos Paperback Cantidad: 10
Impresión bajo demanda
Librería
The Book Depository
(London, Reino Unido)
Valoración
[?]

Descripción Rarebooksclub.com, United States, 2012. Paperback. Estado de conservación: New. 246 x 189 mm. Language: English . Brand New Book ***** Print on Demand *****.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: .in order properly to interpret the results of the photo-chemical observations, and had reached the same conclusions that Professors Bunsen and Koscoe had previously arrived at, unconsciously verifying, by a different experiment, the law of this relation discovered by them and thus announced: (Phil. Trans., 1863, p. 145.) Equal products of the intensity of the light into the time of insolation, correspond, within very wide limits, to equal shades of darkness produced on chloride-of-silver paper of uniform sensitiveness. My plan of experimenting on this subject was rough and simple, like that of the other actinomctrical observations, but quite effective. A sensitized paper strip was first exposed at noon in the precise manner described above in the text, different spaces on the strip receiving different lengths of exposure, and care being taken that the surface of the paper should be exactly at right angles to the course of the solar beam. Immediately af1erwards a second strip was exposed, the board to which it was tacked being, in this case, inclined to the direction of the sun8s rays at such an angle that the shadow of a strip of cardboard projecting from the face of a box previously carefully adjusted so as to exactly face the sun, should, when falling upon the board immediately under it, measure twice the actual width of the cardboard itself. Under these circumstances each space of this sensitized strip received, of course, but one-half the amount of sunlight that impinged upon those of the first strip, and a comparison of the two strips showed that in all cases double the length of exposure was required on the second strip to produce degrees of blackening identical with the shades of the first. The actinomctrical experiments described in the . Nº de ref. de la librería APC9781130643251

Más información sobre esta librería | Hacer una pregunta a la librería

Comprar nuevo
EUR 38,93
Convertir moneda

Añadir al carrito

Gastos de envío: GRATIS
De Reino Unido a Estados Unidos de America
Destinos, gastos y plazos de envío

7.

Simon Newcomb
ISBN 10: 1173816836 ISBN 13: 9781173816834
Nuevos Cantidad: 1
Librería
Castle Rock
(Pittsford, NY, Estados Unidos de America)
Valoración
[?]

Descripción Estado de conservación: Brand New. Book Condition: Brand New. Nº de ref. de la librería 97811738168341.0

Más información sobre esta librería | Hacer una pregunta a la librería

Comprar nuevo
EUR 42,54
Convertir moneda

Añadir al carrito

Gastos de envío: EUR 3,71
A Estados Unidos de America
Destinos, gastos y plazos de envío