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" ... coloured image of the sun first to descend, and then to ascend. Between the descent and ascent when the image seemed stationary, I stopped the prism, and fixed it in that posture, that it should be moved no more. For in that posture the refractions... "
Spectrum Analysis: Six Lectures, Delivered in 1868, Before the Society of ... - Page 27
by Henry Enfield Roscoe - 1870 - 404 pages
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The Spectroscope and Its Work

Hugh Frank Newall - 1910 - 188 pages
...moved no more. For in that posture the refractions of the light at the two sides of the refracting angle, that is at the entrance of the rays into the...often as I would have the refractions on both sides of the prism to be equal to one another, I noted the place where the image of the sun formed by the...
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Scientific Method: Its Philosophy and Its Practice

Frederic William Westaway - 1912 - 474 pages
...that position. For in that position, the refractions of the light at the two sides of the refracting angle, that is at the entrance of the rays into the...refracted light stood still between its two contrary motions; and when the image fell upon that place, I made fast the prism. And in this position it is...
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Eclipses of the Sun

Samuel Alfred Mitchell - 1923 - 574 pages
...posture the refractions of the light at the two sides of the refracting angle, that is at the entrance of it, were equal to one another. So also in other...often as I would have the refractions on both sides of the prism to be equal to one another, I noted the place where the image of the sun formed by the...
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