Am.  Jour.  Pharm.  \ 
November,  1910.  J 
A  Modified  Drying  Tube. 
509 
A  MODIFIED  DRYING  TUBE. 
By  Edwin  Dowzard. 
Some  time  ago  the  writer  was  engaged  in  an  investigation  which 
required  the  use  of  a  train  of  Pelligot  tubes,  charged  with  H2S04, 
for  drying  purposes. 
As  the  H2S04  had  to  be  changed  every  few  days,  it  was  neces- 
sary to  disconnect  the  tubes  for  recharging. 
This  proved  to  be  inconvenient,  owing  to  the  time  required  to 
disconnect  and  connect  a  rather  complicated  apparatus.  To  obviate 
this,  a  stopcock  was  fused  to  the  lower  part  of  the  tube,  see  sketch. 
By  means  of  this  stopcock,  the  H2S04  may  be  removed  and  fresh 
acid  drawn  up  into  the  tube  by  suction. 
