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" ... inch, including the penumbra. For the image was eighteen feet and a half distant from the prism; and at this distance that breadth, if diminished by the diameter of the hole in the window-shut, that is by a quarter of an inch, subtended an angle at... "
The Elements of Optics: Designed for the Use of Students in the University - Page 195
by James Wood - 1801 - 251 pages
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Opticks: Or, A Treatise of the Reflections, Refractions, Inflections and ...

Isaac Newton - 1730 - 403 pages
...by a quarter of an Inch, fubtended an Angle at the Prifm of about half a Degree, which is the Sun's apparent Diameter. But the Length of the Image was...Inches and a quarter, and the Length of the Rectilinear Sides about eight Inches ; and the refracting Angle of the Prifm, whereby fo great a Length was made,...
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Spectrum Analysis: Six Lectures, Delivered in 1868, Before the Society of ...

Henry Enfield Roscoe - 1870 - 514 pages
...by a quarter of an inch, subtended an angle at the prism of about half a degree, which is the sun's apparent diameter. But the length of the image was...inches and a quarter, and the length of the rectilinear sides about eight inches, and the refracting angle of the prism whereby so great a length was made...
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Spectrum Analysis -- Six Lectures

Henry E. Roscoe - 1869 - 372 pages
...by a quarter of an inch, subtended an angle at the prism of about half a degree, which is the sun's apparent diameter. But the length of the image was...inches and a quarter, and the length of the rectilinear sides about eight inches, and the refracting angle of the prism whereby so great a length was made,...
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Spectrum analysis, 6 lects

sir Henry Enfield Roscoe - 1869 - 396 pages
...inch, subtended mi angle at the prism of about half a degree, which is the sun's apparent diameter. Hut the length of the image was about ten inches and a quarter, and the length of the rectilinear sides about eight inches, and the refracting angle of the prism whereby so great a length was made,...
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Spectrum analysis, 6 lects

sir Henry Enfield Roscoe - 1870 - 452 pages
...by a quarter of an inch, subtended an angle at the prism of about half a degree, which is the sun-s apparent diameter. But the length of the image was...inches and a quarter, and the length of the rectilinear sides about eight inches, and the refracting angle of the prism whereby so great a length was made...
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Spectrum Analysis: Six Lectures, Delivered in 1868, Before the Society of ...

Henry Enfield Roscoe - 1873 - 542 pages
...by a quarter of an inch, subtended an angle at the prism of about half a degree, which is the sun's apparent diameter. But the length of the image was...inches and a quarter, and the length of the rectilinear sides about eight inches, and the refracting angle of the prism whereby so great a length was made...
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A Short History of the Progress of Scientific Chemistry in Our Own Times

Sir William Augustus Tilden - 1899 - 284 pages
...by a quarter of an inch, subtended an angle at the prism of about half a degree, which is the sun's apparent diameter. But the length of the image was...inches and a quarter, and the length of the rectilinear sides about eight inches, and the refracting angle of the prism whereby so great a length was made...
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The Spectroscope and Its Work

Hugh Frank Newall - 1910 - 194 pages
...by a quarter of an inch, subtended an angle at the prism of about half a degree, which is the Sun's apparent diameter. But the length of the image was...inches and a quarter, and the length of the rectilinear sides about eight inches ; and the refracting angle of the prism whereby so great a length was made,...
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The Progress of Scientific Chemistry in Our Own Times: With Biographical Notices

Sir William Augustus Tilden - 1913 - 394 pages
...by a quarter of an inch, subtended an angle at the prism of about half a degree, which is the sun's apparent diameter. But the length of the image was...inches and a quarter, and the length of the rectilinear sides about eight inches, and the refracting angle of the prism whereby so great a length was made...
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