Am.  Jour.  Pharm, 
November,  1920. 
1;}    Who  Invented  the  Tall  Percolator? 
797 
Professors  Diehl,  Lloyd,  Remington  and  others,"  and  further  states 
* 'there  will  be  nothing  new  in  the  propositions  here  submitted." 
He  proceeds  to  review  the  various  processes  of  percolation,  simple, 
re-percolation  and  fractional  percolation. 
The  primary  purpose  of  his  paper,  as  set  forth  in  the  title,  was 
a  study  of  the  best  dimensions  for  simple  percolators.  He  concludes 
that  the  "  'tall  and  narrow'  percolators— considerably  taller  in  pro- 
portion to  their  diameter  than  any  heretofore  obtainable  on  the 
market — are  necessary  to  secure  the  proper  exhaustion  of  the  drug 
with  a  moderate  quantity  of  menstruum,  simple  percolation  being 
the  process  followed,"  and  continues  in  the  following  language: 
"The  sole  object  of  using  a  tall  and  narrow  percolator  is  to  increase 
the  height  of  the  column  of  drug  and  menstruum  in  proportion  to 
their  mass." 
After  setting  forth  in  a  tabular  statement  the  dimensions  of  the 
"standard  percolators"  used  under  his  supervision  in  the  pharma- 
ceutical laboratory  of  the  Chicago  College  of  Pharmacy,  he  lays 
down  as  the  rule  for  the  preparation  of  these  "that  the  total  depth 
of  each  percolator  is  uniformly  5  times  its  large  diameter  and  6 
The  Oldberg  percolator  as  described  in  1884. 
