The Collaborative International Dictionary of English v.0.48:

Blowpipe \Blow"pipe`\, n.
   1. A tube for directing a jet of air into a fire or into the
      flame of a lamp or candle, so as to concentrate the heat
      on some object.
      [1913 Webster]

   Note: It is called a mouth blowpipe when used with the mouth;
         but for both chemical and industrial purposes, it is
         often worked by a bellows or other contrivance. The
         common mouth blowpipe is a tapering tube with a very
         small orifice at the end to be inserted in the flame.
         The oxyhydrogen blowpipe, invented by Dr. Hare in
         1801, is an instrument in which oxygen and hydrogen,
         taken from separate reservoirs, in the proportions of
         two volumes of hydrogen to one of oxygen, are burned in
         a jet, under pressure. It gives a heat that will
         consume the diamond, fuse platinum, and dissipate in
         vapor, or in gaseous forms, most known substances.
         [1913 Webster]

   2. A blowgun; a blowtube.
      [1913 Webster]

   Blowpipe analysis (Chem.), analysis by means of the
      blowpipe.

   Blowpipe reaction (Chem.), the characteristic behavior of a
      substance subjected to a test by means of the blowpipe.
      [1913 Webster]