| OCR Text |
Show 2 The current price of these packages, complete with PETN booster and about a l- ft. lead of E- cord ( slender primacord), are as follows: 2 lbs. -$ 0.50, 3 lbs. -$ 0.65, 5 lbs. -$ 1.00, and 10 lbs. - $ 1.75- Our tests were conducted with the 2- lb. bags. In order to test stability, a 2- lb. bag of Plastimite was set up as a target 50 yards away for a 30- 30 rifle ( nominal muzzle velocity 2400 ft./ sec.)- Impact of the bullet scattered about half the contents for 30 ft. in all directions, but caused no detonation. A 1- oz. piece of Plastimite was tossed on a briskly burning fire. It burned with reluctance. A 2- lb. bag of Plastimite was detonated at the surface of a level snow cover. For comparison, a .2- lb. block of tetrytol was detonated nearby. The blast and concussion from the Plastimite were noticeably inferior to that of the tetrytol. In contrast to the bright flash of the tetrytol, the Plastimite produced almost no flash. The Plastimite excavated a crater k ft. in diameter and 1- 1/ 3 ft. deep. The tetrytol excavated an oval- shaped crater 2 ft. deep, with a mean diameter of 65 ft. « The following empirical formulas have been derived from blasting tests in winter snow covers: R = kj W ' 3 and D = k2 W ' 3 where R * radius of blast crater in ft. D = depth of blast crater in ft. charge detonated on snow surface W * weight of explosive in TNT equivalent, lbs. k & IC = constants depending on snow characterists, ft.- lbs." '' |
