A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



129 



out through perforated corks iu the tulles e, one on each side, with additional 

 protection to secure an air-tight joint when not in use. 



\ 



Figure i. — Condensation Chamber. Sectional Elevation. 



Figure la. — The Same in Full 



The air within the box communicates with the outside by three or more 

 stopcocks, of which B is very wide (more than | inch in bore) in order that 

 sudden exhaustion may be made through it. The stopcock C communicates 

 with the atmosphere at a place free from local nucleation, through a length of 

 :^-inch lead pipe; C furthermore communicates with the interior of the box 

 through a flat coil of the same lead pipe , p, lying in the bottom of the trough below 

 the water-level, ww. A coil of lead pipe in a water bath may also be inserted 



