Get Affordable VMs - excellent virtual server hosting


browse words by letter
a b c d e f g h i j k l m n o p q r s t u v w x y z

manograph

manograph


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Manograph  \Man"o*graph\,  n.  [Gr.  ?  thin,  rare  +  -graph:  cf  F. 
  manographe.]  (Engin.) 
  An  optical  device  for  making  an  indicator  diagram  for 
  high-speed  engines.  It  consists  of  a  light-tight  box  or 
  camera  having  at  one  end  a  small  convex  mirror  which  reflects 
  a  beam  of  light  on  to  the  ground  glass  or  photographic  plate 
  at  the  other  end  The  mirror  is  pivoted  so  that  it  can  be 
  moved  in  one  direction  by  a  small  plunger  operated  by  an 
  elastic  metal  diaphragm  which  closes  a  tube  connected  with 
  the  engine  cylinder.  It  is  also  moved  at  right  angles  to  this 
  direction  by  a  reducing  motion,  called  a  reproducer,  so  as  to 
  copy  accurately  on  a  smaller  scale  the  motion  of  the  engine 
  piston.  The  resultant  of  these  two  movements  imparts  to  the 
  reflected  beam  of  light  a  motion  similar  to  that  of  the 
  pencil  of  the  ordinary  indicator,  and  this  can  be  traced  on 
  the  sheet  of  ground  glass,  or  photographed.