Artillery Foot-LEVEL

Artillery Foot-LEVEL is in form of a square, having its two legs or branches of an equal length; at a juncture whereof is a little hole, whence hangs a thread and

Level. and plummet playing on a perpendicular line in the middle of a quadrant. It is divided into twice 45 degrees from the middle. Fig. 7.

This instrument may be used on other occasions, by placing the ends of its two branches on a plane; for when the thread plays perpendicularly over the middle division of the quadrant, the plane is assuredly level. To use it in gunnery, place the two ends on the piece of artillery, which you may raise to any proposed height, by means of the plummet, whose thread will give the degree above the level.