the Plug-Cock Fog- Chamber. 



361 



Pressure and Temperature of the Fog and Vacuum Chambers, for different 

 initial pressures of the latter. 



0° 48° £5° 



The corrections (p 2 ~ Ps) relative to (2 ? ~Ps) ^ e on a curve 

 which passes through zero, but with a larger slope than for 

 dry air. In fact they are much in excess of these cases* 

 and throw the whole phenomenon into a lower region of 

 pressures. 



A few incidental results deserve brief mention. The first 

 of these is the nearly constant difference of about Sp 2 = 2 cm., 

 between the observed value p 2 (nominal) and p 3 . Since for 



* Am. Journ. Sci. vol. xxii. p. 312 (1906). 



