The Collaborative International Dictionary of English v.0.48:

Conciator \Con"ci*a`tor\, n. [It. conciatore, fr. conciare to
   adjust, dress, fr. L. comtus, p. p. See Compt, a.] (Glass
   Works)
   The person who weighs and proportions the materials to be
   made into glass, and who works and tempers them.
   [1913 Webster]