Gearing chain

Gearing \Gear"ing\, n.
   1. Harness.
      [1913 Webster]

   2. (Mach.) The parts by which motion imparted to one portion
      of an engine or machine is transmitted to another,
      considered collectively; as, the valve gearing of a
      locomotive engine; belt gearing; esp., a train of wheels
      for transmitting and varying motion in machinery.
      [1913 Webster]

   {Frictional gearing}. See under {Frictional}.

   {Gearing chain}, an endless chain transmitting motion from
      one sprocket wheel to another. See Illust. of {Chain
      wheel}.

   {Spur gearing}, gearing in which the teeth or cogs are ranged
      round either the concave or the convex surface (properly
      the latter) of a cylindrical wheel; -- for transmitting
      motion between parallel shafts, etc.
      [1913 Webster]