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" ... at the opposite wall of the chamber, and 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.... "
Spectrum Analysis: Six Lectures, Delivered in 1868, Before the Society of ... - Page 27
by Henry Enfield Roscoe - 1870 - 404 pages
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Opticks:: Or, A Treatise of the Reflections, Refractions, Inflections and ...

Isaac Newton - 1730 - 432 pages
...indiftinctly, the Light there decaying and vanifhing by degrees. The Breadth of this Image anfwered to the Sun's Diameter, and was about two Inches and...the Penumbra. For the Image was eighteen Feet and an half diftant from the Prifni, and at this diftance that Breadth, if diminifhed by the Diameter of...
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The Elements of Optics: Designed for the Use of Students in the University

James Wood - 1801 - 251 pages
...the light there decaying and vanifhing by degrees. The breadth of this image anfwered to the fun's diameter, and was about two inches and the eighth...the penumbra. For the image was eighteen feet and an half diftant from the prifm, and at this diftance, that breadth, if diminifhed by the diameter of...
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The Panorama of Science and Art: Embracing the Sciences of ..., Volume 1

James Smith - 1815 - 684 pages
...was oblong, and not oval, but terminated by two rectilinear and parallel sides and two semi-circular ends. On its sides it was bounded pretty distinctly,...the light there decaying and vanishing by degrees. At the distance of 18| feel from the prism, the breadth of the image was about 2£ inches, but its...
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Encyclopaedia Perthensis; Or Universal Dictionary of the Arts ..., Volume 17

1816
...of finding timber, calks, .and other floating articles of the wrecked vefleis, of which 6 or 8 arc two inches and the eighth part 'of an inch, including -the penumbra. Newton. tv) PtNUMBRA, inaftronomy, is a partial (harie obferved between the perfeft lhadow and the...
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Encyclopaedia Britannica; Or A Dictionary of Arts, Sciences, and ..., Volume 15

1823 - 886 pages
...was oblong, and not uval, but terminated by two rcctilimarand parallel sides muí (r, o semicircular ends. On its sides it was bounded pretty distinctly ; but on its ends very indistincily, the light there vanishing by degrees. At the distance of 187 feet from tbe prism the...
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A Manual of Natural and Experimental Philosophy: Being the ..., Volume 2

Charles Frederick Partington - 1828 - 468 pages
...was oblong, and not oval, but terminated by two rectilinear and parallel sides, and two semicircular ends. On its sides it was bounded pretty distinctly...the light there decaying and vanishing by degrees. At the distance of 18i feet from the prism, the breadth of the image was about 2| inches, but its length...
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The London encyclopaedia, or, Universal dictionary of ..., Part 2, Volume 16

Thomas Curtis (of Grove house sch, Islington) - 520 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, is a partial...
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A London Encyclopaedia, Or Universal Dictionary of Science, Art ..., Volume 7

Thomas Curtis - 1829 - 820 pages
...dulinct persons. Lücke. This will puscle all your logick and diitincHora to answer it. Demham'i Sophy. Ncai'.on'i Ojiticlu. In story-telling, besides the marking dutinct characters, and selecting pertinent...
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The Penny Mechanic and Chemist: A Magazine of the Arts and Sciences, Volume 6

1841 - 488 pages
...oblong, and not oval, but terminated with two rectilinear and parallel sides, and two semicircular ends. On its sides it was bounded pretty distinctly,...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 from the prism...
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The British Cyclopaedia of the Arts, Sciences, History, Geography ...

1838 - 1014 pages
...was oblong, and not oval, but terminated by two rectilinear and parallel sides, and two semicircular ends. On its sides it was bounded pretty distinctly...the light there decaying and vanishing by degrees. At the distance of 18J feet from the prism the breadth of the image was about 2;, inches, but its length...
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