As one cubic foot, or 1728 cubic inches, Is to the content of the body, So is the tabular specific gravity To the weight of the body.
GRAPE SHOT.—See the word [Shot].
GRANADES.—Hand granades may be thrown to the distance of 13 fathoms. For their dimensions, see the word [Shell].
GUNNERY.—By the assistance of good tables of practice, and the tables of amplitudes, sines, tangents, and secants, all the cases in gunnery in a nonresisting medium may be easily solved; and perhaps the solution may be sufficiently correct for practice, if the initial velocity of the projectile be not so great as to make the air’s resistance considerable.
For the tables of ranges with ordnance, see the different natures, as Gun, Mortar, &c. and for the tables of amplitudes, sines, tangents, and secants, see pages [151] and [152].
Upon Horizontal Planes.
1. The greatest range is at 45° nearly.
2. The ranges with different elevations with the same charge, are as the double sines of the angles of elevation.
3. Any angle and its complement give the same range nearly.
4. The times of flight, are as the sines of the angles of elevation.