Elements of natural philosophy (Volume 2-3) . Illustration, radiants. The molecules <9r, 02rJ &c, where the longest waves prevail, exhibit red, and those at 0„, 02v, &c., Explanation of where the shortest preponderate, violet or lavender grey,tlie colors the molecules between exhibiting orange, yellow, green, blue and indigo, in the order named, beginning at the red. The line XT, being drawn from the luminous source to the middle of an opaque portion of the grating, the first fringe on either side of this line is formed by secondary waves whose radii differ by X, the second by 2 X, the thir
Elements of natural philosophy (Volume 2-3) . Illustration, radiants. The molecules <9r, 02rJ &c, where the longest waves prevail, exhibit red, and those at 0„, 02v, &c., Explanation of where the shortest preponderate, violet or lavender grey,tlie colors the molecules between exhibiting orange, yellow, green, blue and indigo, in the order named, beginning at the red. The line XT, being drawn from the luminous source to the middle of an opaque portion of the grating, the first fringe on either side of this line is formed by secondary waves whose radii differ by X, the second by 2 X, the third by 3 X, and so on; that is, every fringe is 270 NATURAL PHILOSOPHY. collateral fringes, formed by the conspiring of secondary waves wHose radiidiffer by some even multiple of ±\ while the dark spacbetween are produced by the opposition of waves ofwhich the radii differ by some odd multiple of IX. Effects of lighttransmittedthroughfarrowed glass; Effects of lightreflected fromthe same; Fraunhofer andBartons Fig. 68. § 93. If the furrowedglass be interposed betweenthe eye at <?, and any lu-minous source i, say asmall hole in a windowshutter, the latter will ap-pear flanked on either sideby similar fringes with in-termediate dark spacesbetween also arranged ona right line perpendicularto the direction of the fur-rows, the red appearing onthe outside, the violet onthe inside, with the othercolours in the order justnamed between. And toan eye at 0\ so placed asto receive the light reflect-ed from the ridges of plane glass between the furrows, the whole furrowed space willappear covered by the most beautiful irised hues whichchange with every change of position of the eye. By means of a fine diamond point, Fraunhofer suc-ceeded in forming a ruled surface of glass in which thestriae were actually invisible under the most powerfulmicroscope, the interval of the furrows being only golooof an inch. In some furrowed surfaces produced by , the lines are so c
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