What is "shunt gun"

Shunt \Shunt\, n. [Cf. D. schuinte slant, slope, declivity. See Shunt, v. t.]

1. (Railroad) A turning off to a side or short track, that the principal track may be left free.

2. (Elec.) A conducting circuit joining two points in a conductor, or the terminals of a galvanometer or dynamo, so as to form a parallel or derived circuit through which a portion of the current may pass, for the purpose of regulating the amount passing in the main circuit.

3. (Gunnery) The shifting of the studs on a projectile from the deep to the shallow sides of the grooves in its discharge from a shunt gun.

   Shunt dynamo (Elec.), a dynamo in which the field circuit is connected with the main circuit so as to form a shunt to the letter, thus employing a portion of the current from the armature to maintain the field.

   Shunt gun, a firearm having shunt rifling. See under Rifling.