TIIKRMAL PROPKRTIKS OF CMJimMC ACID AT LOW TKMI'KK ATURKS. 71 



line DFA represents the cooling ami oondeoMtion in the condenser, loth at constant 

 pressure p t . 



The ])iv.s.surr-tiMn|MT:ituiv mm- was iL-tcnniiicd with the apparatus working in 

 this way : A pressure gauge was rumu-rted to the pipe immediately after the throttle 



A. 



I A const: 



B Pi 



ft If 



Approximate 6t diagram 

 for freezing machine cycle. 



Entropy 



r Q. 





Fig. 2. 



valve and a thermo-jiinction inserted at the same place, as shown in fig. 1. The gas 

 is always saturated at this point so that the temperature is unaffected by radiation 

 or conduction along the pipes. By varying the adjustment of the throttle valve a 

 series of readings of corresponding pressures and temperatures was obtained ; a 



Fig. 3. 



summary of the olervations is given in Table I. The olwervations were plotted and 

 a smooth curve drawn through them. Figures taken from the smooth curve are 

 i^iven in Table IX. The smooth curve is copied in fig. 18, p. 95, for comparison with 

 previous observations. 



