. Carnegie Institution of Washington publication. CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. the incidental data shown in table 34, obtained with fog particles about cm. in diameter, belonging to the large yellow-blue corona. TABLE 34.—Contraction of coronas during subsidence. Bar. cm.; temp. 27° C.; factor ; temp, factor t. 5. •• nX io~3. t. S. s. nXio~3. I. sec II sec 0 12. 0 920 0 1140 30 IO. 2 600 30 730 60 10. I 350 60 400 90 7-3 220 90 7-4 230 The coronas shrink as the fog particles increase in number and
. Carnegie Institution of Washington publication. CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. the incidental data shown in table 34, obtained with fog particles about cm. in diameter, belonging to the large yellow-blue corona. TABLE 34.—Contraction of coronas during subsidence. Bar. cm.; temp. 27° C.; factor ; temp, factor t. 5. •• nX io~3. t. S. s. nXio~3. I. sec II sec 0 12. 0 920 0 1140 30 IO. 2 600 30 730 60 10. I 350 60 400 90 7-3 220 90 7-4 230 The coronas shrink as the fog particles increase in number and de- crease in size at an accelerated rate. The initial rates must be estimated at a decrement of number greater than i . 4 per cent per second, supposing that no water is added from other sources than the evaporation of smaller particles. In 100 seconds about 80 particles have escaped out of each 100. The case is much more serious for larger coronas, so that these are characteristic- ally fleeting and must be ob- served at once. It may not be impossible that rapidity of evaporation itself sets a limit to the largest coronas pro- ducible. The nuclei, however, are not lost as a rule. They occur as water nuclei and are. ZOO Sec. zo 40 60 80 100 FIG. 25.—Nucleation n, computed from aperture s of the coronas, gradually shrinking during the subsidence within 100 seconds after ex- haustion. available for the next coronas, if not removed. It follows, then, that for these cases the method of subsidence is not applicable, as the corona changes totally before measurable subsidence is recorded. Hence an instantaneous procedure like the goniometer method or the present method is alone available. 51. Data. — In table 35 I have inserted results obtained with phos- phorus nuclei, leaving out the initial fogs. It is seen at once that large coronal diameters are actually measurable, a result not possible hitherto. Reduced to the goniometer method, the present results may be written 0
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