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Home > Art, Film & Photography > Reports on Observations of the Total Eclipse of the Sun, August 7, 1869 Volume 3; Conducted Under the Direction of Commodore B. F. Sands, U. S. N., Superintendent of the U. S. Naval Observatory, Washington
Reports on Observations of the Total Eclipse of the Sun, August 7, 1869 Volume 3; Conducted Under the Direction of Commodore B. F. Sands, U. S. N., Superintendent of the U. S. Naval Observatory, Washington

Reports on Observations of the Total Eclipse of the Sun, August 7, 1869 Volume 3; Conducted Under the Direction of Commodore B. F. Sands, U. S. N., Superintendent of the U. S. Naval Observatory, Washington


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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. 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 ...


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Product Details
  • ISBN-13: 9781130643251
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 84
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1130643255
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 168 gr


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Reports on Observations of the Total Eclipse of the Sun, August 7, 1869 Volume 3; Conducted Under the Direction of Commodore B. F. Sands, U. S. N., Superintendent of the U. S. Naval Observatory, Washington
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Reports on Observations of the Total Eclipse of the Sun, August 7, 1869 Volume 3; Conducted Under the Direction of Commodore B. F. Sands, U. S. N., Superintendent of the U. S. Naval Observatory, Washington
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Reports on Observations of the Total Eclipse of the Sun, August 7, 1869 Volume 3; Conducted Under the Direction of Commodore B. F. Sands, U. S. N., Superintendent of the U. S. Naval Observatory, Washington

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