The theory of self‐preserving size distributions of Friedlander and Wang has been applied to particle formation after nuclear air bursts. The parameters at the start of coagulation are those derived from nucleation theory as applied by Stewart and by Edvarson. Brownian motion with and without slip correction has been considered. The results are compared with the log normal distribution having a logarithmic standard deviation of 2.0 such that both distributions have the same value of the geometric mean diameter. At constant mass 〈a〉 varies slowly with yield, namely, it varies as W−0.23. Contours of constant 〈a〉 as a function of mass and yield have been calculated. The results are compared with size distributions measured on cap and stem samples from eight air bursts of the 1962 Dominic series.

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The liquidus curves of the Bi-Cu, Bi-hg, and Bi-Au systems Rere redetermined by a sampling method.The eutectic was determined to be at 270.6 f 0.1" at 0.46 atom % copper (0.14 wt. 70).The Bi-Ag The eutectic was found at 262.5 & 0.2" a t 4.95 rt The Bi-Cu liquidus agrerd fairly well with Kleppa's data over the range investigatedThe Bi-Au liquidus Below the peritectic temperature, a completely new liquidus The peritectic was found at 371 rt 2" by means of differential thermal analysis, the composition The The results curve nas somewhat shifted from the previously determined location. 0.05 atom 70 silver (2.62 wt. 70). by him. did not agree well with the few experimental data available. curve was established.being 23.1 atom yo gold (24.1 at. 70).heats of fusion of the four elements agreed reasonably well with the literature values, except that of bismuth. show that the sampling method is, for many cases, well adapted for the determination of liquidus curves.The eutectic is a t 13.4 =t 0.2 atom %;o gold (14.1 wt. yo) at 241.5 =k 0.5'.

The kinetics of the reaction KzCazMg(SO&.2Hz0 .-f K2CaMg(S0& + CaSOa -I-2H20 was studied by an iso-Differential thermal Below about 1.5 bars Between 1.7 and 6.1 bars, the results can be expressed as thermal method. analysis was used to determine the decomposition pressures between 0.5 and 6.1 bars. the reliability of the measurements is questionable. log P H~~ = 27.77 -1.75 X 104/T.The reaction is first order with log k (min.-I) = 21.50 -1.22 X IO4/?".