Am.  Jour.  Pharm.  > 
May,  1880.  i 
Improved  Troche  Board, 
an  inch  on  one  edge,  tapering  to  \  of  an  inch  on  the  other,  and  are 
firmly  attached  to  the  board,  one  on  each  end,  the  bevels  both  tapering 
an  the  same  direction.  The  board  is  surrounded  by  a  frame,  i  inch 
thick,  3  inches  in  height  on  the  sides,  and  2f  inches  upon  the  ends,  so 
Troche  Board  and  Roller. 
that  the  sides  project  f  of  an  inch  above  the  ends.  There  is  a  second 
frame  inside  the  outer  one,  and  beneath  the  board,  which  is  made  to 
move  back  and  forth  in  two  grooves  cut  in  the  outside  frame,  one  on 
■each  side  ;  upon  this  inner  frame  there  are  two  beveled  pieces  firmly 
secured,  and  corresponding  to  the  strips  attached  to  the  board.  When 
the  inner  frame  is  caused  to  move  forward  (by  a  screw  which  is  fast- 
ened by  a  plate  upon  the  frame)  the  beveled  strips  attached  to  the  inner 
frame  press  against  the  beveled  strips  attached  to  the  board,  and  by 
continued  force  the  board  is  caused  to  ascend  in  the  frame  ;  by  turn- 
ing the  screw  in  the  opposite  direction  the  frame  is  drawn  back  to  its 
former  position  and  the  board  falls  again,  in  a  horizontal  direction.  It 
is  impossible  for  the  frame  to  spring  from  its  position,  as  it  is  firmly 
held  by  the  grooves.  The  board  may  be  taken  out  at  will  and  cleaned 
after  use.  The  beveled  strips  serve  to  keep  the  board  from  twisting. 
The  board  can  be  raised  or  lowered  f  of  an  inch,  the  entire  capacity  ; 
it  requires  15  complete  revolutions  of  the  screw  to  raise  it  the  entire 
distance,  or  40  to  the  inch  j  by  turning  the  screw  but  one-half  of  a 
revolution  the  board  is  raised  -^-^  of  an  inch,  and,  in  fact,  any  desired 
