In English billiards, a cannon is when one's cue ball strikes the other player's cue ball and the red ball on the same shot; and it is worth two points.

The cholla was two feet high, and six feet in diameter.

a stanch ship

At the back of the cars, one in each, and very upright, sat two dark, bejewelled, deep-bosomed women who had no eyes for the flying landscape but smiled at each other with unhealthy concentration.