Q. Name the principal parts of a built-up gun.

A. The tube, jacket, hoops, and trunnion-band. (See Figs. 5, 6, and 23.)

BUILT UP GUN. Fig. 5.

Q. What is a wire-wound gun?

A. One in which wire takes the place of the jacket and hoops and is wound over the tube. The wire is really in the form of a ribbon.

Q. Define the breech-reinforce.