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collimation

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collimation


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Collimation  \Col`li*ma"tion\,  n.  [Cf.  F.  collimation,  fr  a 
  false  reading  (collimare)  for  L.  collineare  to  direct  in  a 
  straight  line  col-  +  linea  line  Cf  {Collineation}.] 
  The  act  of  collimating;  the  adjustment  of  the  line  of  the 
  sights,  as  the  axial  line  of  the  telescope  of  an  instrument, 
  into  its  proper  position  relative  to  the  other  parts  of  the 
  instrument. 
 
  {Error  of  collimation},  the  deviation  of  the  line  collimation 
  of  an  astronomical  instrument  from  the  position  it  ought 
  to  have  with  respect  to  the  axis  of  motion  of  the 
  instrument. 
 
  {Line  of  collimation},  the  axial  line  of  the  telescope  of  an 
  astronomical  or  geodetic  instrument,  or  the  line  which 
  passes  through  the  optical  center  of  the  object  glass  and 
  the  intersection  of  the  cross  wires  at  its  focus. 




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