US Bomb, 1000 lb Chemical, AN-M79
The body of the AN-M79 was one-piece cast steel and had a steel burster well 2.5 inches in diameter, running axially through it. The burster well expanded in both the nose and baseplate before welding, which eliminated decomposition of chemical fillers due to the presence of crevices. The baseplate differed from that of the standard general purpose bomb in that it was forge welded to the case and contained the M1 needle valve. It also had a 1.25-inch filling hole closed by a soft iron gasket, a hard steel gasket plug, and a threaded closing plug. The M16 booster was used in the burster well and consists of a waterproof fiber tube filled with 4.45 pounds of tetryl.
The AC and CG loaded bombs were equipped with a 1.75-inch diameter threaded stainless steel plug containing a sampling valve installed in the base plugs. The valve body contained a spindle valve bearing against a 0.25-inch seat, and had an outlet hole threaded for a 3/8-inch pipe plug. The valve body was seated on a soft iron washer on a shoulder, and held in place by a threaded steel bushing, which was screwed down on top of the valve body. This valve was used for tests on the AC filler every 60 days or just prior to shipment, or surveillance tests on the CG filler, as directed.
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