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" Its spectrum is marked, as is known, in its whole extent by a multitude of irregularly grouped luminous lines: but among these may be remarked a double line situated at the boundary of the yellow and orange. As this double line recalled by its form and... "
The Spectroscope and Its Work - Page 62
by Hugh Frank Newall - 1910 - 163 pages
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Transactions of the Royal Scottish Society of Arts, Volume 6

Royal Scottish Society of Arts - 1864 - 430 pages
...incandescence. In 1849, M. Foucault, while examining the prismatic spectrum of the electric light, caused an image of the sun, formed by a converging lens, to fall on the electric arc itself, thus enabling him to observe both spectra simultaneously. By this experiment he...
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Once a Week

Eneas Sweetland Dallas - 1870 - 532 pages
...by its form and position, the n line of the solar spectrum, I wished to try if it corresponded with it ; and, in default of instruments for measuring...caused an image of the sun, formed by a converging lens (popularly called a glass bull's-eye), to fall on the arc itself, which allowed me at the same time...
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Cosmology, Atomic Theory, Evolution: Classic Readings in the Literature of ...

Sir William Cecil Dampier Dampier, Margaret Dampier - 2003 - 312 pages
...analysis of the voltaic arc formed between charcoal poles, M. Foucault writes as follows (p. 45): — " Its spectrum is marked, as is known, in its whole...electric and the solar spectrum superposed; I convinced mvself in this way that the double bright line of the arc coincides exactly with the double dark line...
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Once a Week

Eneas Sweetland Dallas - 1870 - 540 pages
...by its form and position, the D line of the solar spectrum, I wished to try if it corresponded with it ; and, in default of instruments for measuring...had ¡ recourse to a particular process. I caused i an image of the sun, formed by a convergI ing lens (popularly called a glass bull's-eye), I to fall...
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