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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Circumferentor  \Cir*cum`fer*en"tor\,  n.  [See  {Circumfer}.] 
  1.  A  surveying  instrument,  for  taking  horizontal  angles  and 
  bearings;  a  surveyor's  compass.  It  consists  of  a  compass 
  whose  needle  plays  over  a  circle  graduated  to  360[deg], 
  and  of  a  horizontal  brass  bar  at  the  ends  of  which  are 
  standards  with  narrow  slits  for  sighting,  supported  on  a 
  tripod  by  a  ball  and  socket  joint. 
  2.  A  graduated  wheel  for  measuring  tires;  a  tire  circle.