. Carnegie Institution of Washington publication. PHOTOGRAPHIC STUDIES OF LUMINESCENCE. 127 I 50 40 30 20 10 slit opened 40 units. Curves 1,2,3, and 4 represent the spectra of acetylene light at intensities 32, 16, 8, and 4 respectively. Curve 7 represents the spectrum of the fluorescence light. Curve 6 represents the distribution of energy in the acetylene flame and is assumed to correspond to curve 3. Then the energy curve corresponding to curve 2 will have ordinates equal to 16/8 times the corresponding ordinates of curve 6, etc. Wherever curve 7 crosses curve 3, the energy for that wave-le
. Carnegie Institution of Washington publication. PHOTOGRAPHIC STUDIES OF LUMINESCENCE. 127 I 50 40 30 20 10 slit opened 40 units. Curves 1,2,3, and 4 represent the spectra of acetylene light at intensities 32, 16, 8, and 4 respectively. Curve 7 represents the spectrum of the fluorescence light. Curve 6 represents the distribution of energy in the acetylene flame and is assumed to correspond to curve 3. Then the energy curve corresponding to curve 2 will have ordinates equal to 16/8 times the corresponding ordinates of curve 6, etc. Wherever curve 7 crosses curve 3, the energy for that wave-length is represented by the ordinate on curve 6 for that wave-length. Wherever curve 7 crosses curve 2, the energy for that wave-length is 16/8 times the ordinate of curve 6 for that wave-length, etc. Since the curves intersect at only a was necessary to get other points on the desired energy curve by interpolation. This was done sys- tematically and as follows: Suppose wave-length m is under consideration. A curve is plotted with the intensities of acetylene, 4, 8, 16, and 32, as abscissas and the intersections of the vertical at /n with the curves 1, 2, 3, i L l\ \\ \'\i\\ \\ * !) t 1 »2 3 1= 4 8 16 Fig- 134- 32. and 4 as ordinates. From this curve is picked off the intensity of acety- lene that would have coincided with curve 7 at wave-length ;ui. Fig. 134 shows six curves drawn in connection with Fig. 133. Curves 1, 2, 3, 4, 5, and 6 correspond to wave-lengths ,0 = , , , , , and respectively. The circle on each curve shows the point picked off. On curve 6, Fig. 134, is the abscissa corresponding to , the ordinate on curve 7, Fig. 133, at ^ = Hence the ordinate at ju = on curve 5, 133, which shows the distribution of energy of the fluorescence light is Fig. equal to 23-5 times , the ordinate on curve 6, Fig. 133, at ^ = Curve 5, Fig. 133, shows the energy curve of fluorescence as computed from the other curves
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