This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...p, computed, is always above / observed, so that the fog chamber begins to heat itself above the temperature ri before the cock can be closed again and contains less than its normal allotment of air. Thus, in the example given, P, /p, = O.9i;, = 47.9, observed; and ft = 49.9, computed. Hence p and pi alone have any ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...p, computed, is always above / observed, so that the fog chamber begins to heat itself above the temperature ri before the cock can be closed again and contains less than its normal allotment of air. Thus, in the example given, P, /p, = O.9i;, = 47.9, observed; and ft = 49.9, computed. Hence p and pi alone have any definite meaning for the fog chamber. 49. Observations with 4-inch exhaust pipes.--The observations of this paragraph, apart from the exhaustion difficulties already discussed, were made peculiarly difficult by the unavoidable leak from fog chamber to vacuum chamber through the large exhaust cock. It was therefore essential to wait many hours for each observation, since the coronas corresponding to the second, third, etc., of successive exhaustions were smaller than the first. This can not be due to any other cause than the presence of water nuclei from the fog of the first exhaustion. A given corona, moreover, was apt to decrease in aperture as much as one-half during the period of subsidence, showing growth of certain particles at the expense of others, the latter being afterwards detected in the water nuclei specified. This must also be attributed to the continued slow exhaustion due to the leak in question. In table 2i and fig. 3i the earlier data with 4-inch pipes are given, chiefly with the object of direct comparison with foregoing results with 2-inch pipes. The meaning of the data is clear from the earlier tables, and the dp here mentioned is the isothermal value observed at the fog chamber as heretofore. On March i6 to i8 the data are irregular in the way common to observations in a newly adjusted apparatus. The effective nucleation is too small from the presence of interior sources of relatively bulky nuclei. A fairly comp...
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