EFFICIENCY OF PLUG-COCK FOG CHAMBER. 



5. Computation of \Jv. Since (v l /v) k/c = p/p l , the volume expan- 

 sion is a cumbersome datum to compute rigorously, and it appears as 



v 



71 i \ V / 7T, 



L_ I _i_ / T 1 



*i-c/k V \\ <b i-c/& 



where an approximate value of p : (nearly p 3 , observed) must be placed 



?*\ 



-tLO. 



60 



FIG. 2. Same as fig. i, if the temperature ratio is corrected 

 and reads r/i: l 



in the vapor-pressure terms of the second member. For distinction [v/ V] 

 here denotes the volume ratio of fog and vacuum chambers. The terms 

 involving vapor pressure may often be neglected, whereupon the equation 



v f p'(i-clk)+ v /v p fp\ c!k 



v = p a (i+v/V) W 



reappears, if the equivalent of p t be inserted. In these cases p^ may 

 again be replaced by p 3 . 



