US Bomb, 500 lb Chemical, AN-M78
The 500 pound AN-M78 bomb was an aerial bomb that was fin stabilized and cylindrical in shape with an ogive nose and conical tail. The body of the bomb was a one-piece, cast steel construction with a burster well extending the entire length of the bomb. The burster well was threaded at the forward end to receive the nose fuze and at the aft end to receive the adapter booster and tail fuze. The base plug consisted of a special forging welded to the case containing the M1 needle valve. An AN-M1 needle valve was installed in the baseplate.
A standard box type fin assembly was screwed to the bomb by a locking nut, which threaded to the base plug.
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