1. 
   Fiducials
   In general, reference marks to which particle trajectories are compared; may apply to wire spark chambers, optical spark chambers, bubble chambers, etc. In particular, permanent reference markings in SWIC displays to facilitate the referencing of beam trajectories in beam lines.
   Found op http://www-bdnew.fnal.gov/operations/accgloss/gloss.html
   
   
2. 
   Fiducials
   In general, reference marks to which particle trajectories are compared; may apply to wire spark chambers, optical spark chambers, bubble chambers, etc. In particular, permanent reference markings in SWIC displays to facilitate the referencing of beam trajectories in beam lines.
   Found op http://www-bdnew.fnal.gov/operations/accgloss/gloss.html#A
   
   

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