As™ptJe°mber,bi9o™"}    Powder  Mixer  and  Percolator  Support,  409 
on  each  arm).  The  end  of  each  axle  is  shaped  to  receive  a  crank, 
though  two  are  hardly  ever  needed  except  when  very  large  quan- 
tities of  powder  are  to  be  mixed.  In  using  the  mixer  the  powder  is 
passed  through  a  coarse  sieve  into  the  mixer  (to  break  up  any  pos- 
sible lumps),  the  lid  screwed  down,  and  by  turning  the  crank  the 
box  is  caused  to  revolve.    The  height  of  the  box,  and  the  fact  ot 
the  box  being  square,  causes  the  powder  to  shift  from  end  as  the 
mixer  revolves  and  mixes  the  powder  thoroughly  if  the  mixer  is 
not  run  too  rapidly. 
The  cross-pieces  of  the  frame,  the  lid  and  all  the  wood  work, 
except  the  box,  are  fastened  together  with  screws.  The  box  is 
nailed  securely. 
