 ... observed the figure and dimensions of the solar image formed on the paper by that light. This image was oblong and not oval, but terminated with two rectilinear and parallel sides, and two semicircular ends. On its sides it was bounded pretty distinctly,...  A Treatise on Geometrical Optics - Page 160by Robert Alfred Herman - 1900 - 344 pagesFull view - About this book
 | Thomas Curtis (of Grove house sch, Islington) - 512 pages
...PENUM'BRA, as I at. ptne and umbra. An imperfect shadow ; that part of the shadow which is half enlightened. The breadth of this image answered to the sun's diameter, and was about two inches and t!ic piuhth pirt of an inch, including the penumbra. AVulim. PEN PENUMBRA, in astronomy,... | |
 | 1841 - 488 pages
...refracted light fall perpendicularly upon a sheet of white paper at the opposite wall of the chamber, and observed the figure and dimensions of the solar...image answered to the sun's diameter, and was about two inches and an eighth, including the penumbra. For the image was eighteen feet and a half distant... | |
 | Henry Enfield Roscoe - 1870 - 514 pages
...oblong and not oval, but terminated with two rectilinear and parallel sides, and two semicirciilar ends. On its sides it was bounded pretty distinctly,...image answered to the sun's diameter, and was about two inches and the eighth part of an inch, including the penumbra. For the image was eighteen feet... | |
 | sir Henry Enfield Roscoe - 1869 - 396 pages
...parallel sides, and two semicircular ends. On its sides it was bounded pretty distinctly, but on its cuds very confusedly and indistinctly, the light there...image answered to the sun's diameter, and was about two inches and the eighth purl, of an inch, including the penumbra. For the image was eighteen feet... | |
 | Osmund Airy - 1870 - 606 pages
...parallel sides by which it was bounded pretty distinctly, while its ends were confused and indistinct, the light there decaying and vanishing by degrees....breadth of this image answered to the Sun's diameter. This elongated stripe PQ, the height of which is about five times its breadth, is fpund to be of different... | |
 | sir Henry Enfield Roscoe - 1873 - 550 pages
...refracted light fall perpendicularly upon a sheet of white paper at the opposite wall of the chamber, and observed the figure and dimensions of the solar...image answered to the sun's diameter, and was about two inches and the eighth part of an inch, including the penumbra. For the image was eighteen feet... | |
 | Henry Enfield Roscoe - 1873 - 542 pages
...refracted light fall perpendicularly upon a sheet of white paper at the opposite wall of the chamber, and observed the figure and dimensions of the solar...image answered to the sun's diameter, and was about two inches and the eighth part of an inch, including the penumbra. For the image was eighteen feet... | |
 | Thomas Preston - 1890 - 494 pages
...it was bounded pretty distinctly, but on its ends very confusedly and indistinctly, the light thus decaying and vanishing by degrees. The breadth of...image answered to the sun's diameter, and was about 2J inches . . . but the length of the image was about 10 J inches, and the length of the rectilinear... | |
 | Thomas Preston - 1895 - 612 pages
...it was bounded pretty distinctly, but on its ends very confusedly and indistinctly, the light thus decaying and vanishing by degrees. The breadth of...answered to the sun's diameter, and was about 2^ inches . . . but the length of the image was about 10^ inches, and the length of the rectilinear sides about... | |
 | Sir William Augustus Tilden - 1899 - 296 pages
...upwards towards the opposite wall of the chamber, and there form a coloured image of the sun. . . . This image was oblong and not oval, but terminated...image answered to the sun's diameter, and was about two inches and the eighth part of an inch, including the penumbra. For the image was eighteen feet... | |
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