332 OC. M. Warren ona Process of Hractional Condensation. 
with vulcanized caoutchouc, ai 
or by means of a perforated cork, which 1 ( ig 
of both tubes as snugly as possible, and then tightly pret 
gether upon the joint by means of an iron clamp, aS SHOW™ © 
g, fig. 2. This clamp is figured ona larger scale at EK. en 
is highly important that all joints in the apparatus should 0 
required too frequent renewal. I have found the cloth cove! 
with vulcanized caoutchouc preferable to the common ©" 
choue tubing. In the smaller sizes of apparatus I have ee 
of the worm itself project far enough from the bath to connect porte 
directly with the retort by means of a perforated cork, witho ut 
the use of an additional connecting tube. 
