The Collaborative International Dictionary of English v.0.48:

Founder \Found"er\, n. [From Found to cast.]
   One who founds; one who casts metals in various forms; a
   caster; as, a founder of cannon, bells, hardware, or types.
   [1913 Webster]

   Fonder's dust. Same as Facing, 4.

   Founder's sand, a kind of sand suitable for purposes of
      molding.
      [1913 Webster]