Minutes  of  the  Pharmaceutical  Meeting. 
Am.  [our  Pharm- 
Dec,  1880, 
ical  blouj-pipe.  The  general  appearance  of  the  blow  pipe  is  shown  in  Fig.  i,  and 
its  internal  construction  will  be  readily  understood  by  referring  to  Fig.  2,  which  is  a 
central  vertical  section.  The  pump  cylinder  is  mounted  on  an  arched  stand  and 
contains  a  piston  having  a  valve  opening  upward.  The  piston  is  connected  to  the 
foot  pedal  by  a  forked  connecting  rod,  and  is  moved  by  a  slight  and  easy  motion  of 
the  foot.  The  upper  end  of  the  pump  cylinder  is  closed,  with  the  exception  of  a 
valve  aperture,  which  is  covered  by  a  valve  opening  upward  into  a  cylindrical  air 
reservoir  secured  to  the  upper  end  of  the  pump.  Near  the  top  of  the  air  reservoir 
there  is  a  nipple  to  which  is  attached  a  flexible  tube  communicating  to  the  blow- 
pipe. The  pipe  outlet  is  much  smaller  than  in  the  mouth  blow-pipe  to  permit  of 
maintaining  a  pressure,  which  may  be  increased  or  diminished  by  a  quick  or  slow 
White's  Pill  Mass  Divider. 
motion  ot  the  treadle.  The  air  chamber  is  easily  filled,  and  when  charged  affords 
a  constant  supply  of  pure  air.  The  machine  is  light  and  portable,  weighing  but  iz 
pounds  and  measuring  24  inches  in  height.  Tlie  pump  cylinder  is  ^h  inches  in 
diameter,  with  3  inches  stroke.  For  light  and  delicate  work  when  a  gentle  flame 
is  required,  a  pressuie  of  one  or  two  pounds  is  given,  but  for  brazing,  annealing, 
fusing,  etc.,  when  a  large  flame  is  necessary,  a  few  rapid  strokes  of  the  plunger  will 
raise  the  prchsnre  in  the  receiver  to  from  10  to  12  pounds,  which  can  be  sustained 
