Source : Webster's Revised Unabridged Dictionary (1913)

Blowtube \Blow"tube`\, n.
   1. A blowgun. --Tylor.

   2. A similar instrument, commonly of tin, used by boys for
      discharging paper wads and other light missiles.

   3. (Glassmaking) A long wrought iron tube, on the end of
      which the workman gathers a quantity of ``metal'' (melted
      glass), and through which he blows to expand or shape it;
      -- called also {blowing tube}, and {blowpipe}.