. Carnegie Institution of Washington publication. REVERSED AND NON-REVERSED SPECTRA. 153 in the preceding table. Hence this discrepancy has been eliminated. What is most interesting is that the 4-inch tube shows no consistent difference in the 7 values for high or low exhaustion. Thus the mean values under increas- ing exhaustion, p, are £ = 7= 1-35 i-3S Accidentally the highest value of 7 belongs to the highest exhaustion. The chief anticipation of the work (, that with a 4-inch tube the true value of 7 would appear) has not been fulfilled. The valu
. Carnegie Institution of Washington publication. REVERSED AND NON-REVERSED SPECTRA. 153 in the preceding table. Hence this discrepancy has been eliminated. What is most interesting is that the 4-inch tube shows no consistent difference in the 7 values for high or low exhaustion. Thus the mean values under increas- ing exhaustion, p, are £ = 7= 1-35 i-3S Accidentally the highest value of 7 belongs to the highest exhaustion. The chief anticipation of the work (, that with a 4-inch tube the true value of 7 would appear) has not been fulfilled. The value obtained is still much below normal, successive results ranging as follows: Diameter of tube cm. Mean 7 cm. Diameter of exhaust pipe The relatively small increase between the tubes 5 cm. and 10 cm. in diam- eter is disappointing. At the rate obtained from the first two experiments (see fig. 95) a 3-inch tube should have been nearly sufficient. At the rate established by the last two observations, however, a tube at least inches. 1-0 0 95 in diameter would be needed to obtain trustworthy values of 7. These differ- ences are possibly due to the exhaust pipe, which in case of the last observation does not increase in size. Hence a 3-inch pipe with a 4-inch stopcock may be estimated as being adequate for 7 measurement, provided the exhaust pipe is straight and clear throughout. The observations were broken off at this point, with the object of searching for some means of obtaining a more sensitive and regular interference pattern. If the method is to be ultimately successful, then icr4 cm. on the micrometer must be guaranteed. If the ellipses are not quite regular or not closed, this is not the case. A more sensitive method of defining optic density is thus in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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