EXPERIMENTAL WORK. 



269 



compartment ; and falls over the second division, passing under the 

 third into the fourth compartment, where it rises over the fourth 



FIG. 194 scale J. 



division into the fifth, and passing below the fifth division into the 



FIG. 195 scale i. 



last compartment, it rises to the pipe, through which it escapes. 



FIG. 196 scale . 



