EXPLOSION 

VESSEL :; ///%t ti a state of gas; or between p and v, the reciprocal of D, which may be called the gravimetric volume (G . V.), being the ratio of the volume of the gas to the volume of an equal weight of water . The results are also embodied in the following Table:- G.D . G.V . Pressure in Tons per sq. in . Pebble Powder . Cordite . 0.05 20.00 0.855 3.00 6 16.66 1.00 3.8o 8 12.50 1.36 5.40 O•IO IO.00 I16 7.I0 12 8.33 2.06 8.7o 14 7'14 2.53 10.50 15 6.66 2.73 11.36 16 6.25 2.96 12.30 18 5.55 3'33 14.20 20 5.0o ' 3.77 16•oo 22 4'54 4'26 17.90 24 4.17 4.66 19.80 25 4.00 4.88 20.63 26 3.84 5'IO 21.75 30 3'33 6•o7 26.00 35 2'85 7.35 31.00 40 2.50 8'73 36.53 45 2.22 10.23 42.20 50 2.00 11.25 48.66 55 1.81 13.62 55.86 6o I.66 15'55 63.33 The term gravimetric density (G.D.) is peculiar to artillerists; it is required to distinguish between the specific gravity (S . G.) of the powder filling a given volume in a state of gas, and the specific gravity of the separate solid grain or cord of powder . Thus, for instance, a lump of solid lead of given S . G., when formed into a charge of lead shot composed of equal spherules closely packed, will have a G.D. such that (4) G.D. of charge of lead shot =l6~~2=0 7403 . S.G. of lump of solid lead while in the case of a bundle of cylindrical sticks of cordite, (5) G.D. of charge of cordite _ 1~ 3 = 0.9067 .

S.G. of stick of cordite 6-At the

standard temperature of 62° F. the volume of the gallon of to lb of water is 277.3 cub. in.; or otherwise, i cub. ft. or 1728 cub .