Fuzes: Inertia impact fuze.

Over-all length: 13 1/2 inches.

Length of body: 8 5/16 inches.

Diameter of body: 2 1/8 inches.

Thickness of wall: 3/8 inch.

Material of wall: Magnesium.

Type of suspension: Cluster container.

Suspension lug: None.

Color and markings: Black over-all (prime coat of gold paint on the body only).

Length of tail: 5 1/8 inches.

Width of tail: 2 1/8 inches.

Width of tail fins: 1 1/16 inches.

Dimensions of tail trusts: 13/16 inch wide.

Material of tail: Light sheet metal.

Type of filling: Thermite.

Total weight of bomb: 2 pounds 12 ounces.

Construction of body: The bomb consists of a nosepiece, incendiary filled body and explosive filled tail. The nosepiece is made of magnesium and screws into the bomb body. At the flat forward end it is threaded centrally to receive the brass firing pin holder which contains a fixed steel firing pin. At the after end it is pierced by a flash hole. The recess within the nose-piece houses a movable detonator carrier and a creep spring. An off-center transverse safety pin prevents the detonator carrier from hitting the firing pin. The body is a thermite-filled cylindrical magnesium tube. The forward end is threaded in-ternally to receive the nose-piece. The after end is boat-tailed to accommodate the co-nical tail cone. Three-fourths inch aft of the forward end are four vent holes, 90° apart. The conical tail cone, made of light sheet metal, slips over the boat-tailed after body of the bomb, and is secured to it by four screws. Each of the three fins, which are made of the same material as the cone, has its inner edge turned and held to the cone by four rivets. Where the three fins meet aft of the apex of the tail cone, they are braced and held together by angular metal strips, which are riveted onto both sides of each fins by two rivets. The outer edge of each fin is turned for a distance of 3/4 inch from the after end. Six rivets hold these turned edges to a circular strut. Filling the inside of the tail cone is a conical cloth bag containing a pyrotechnic mixture which may have explosive properties.

Operation: The fuze is armed when the safety pin is removed. On impact the detonator carrier moves down against the creep spring and hits the firing pin. The resultant flash ignites the thermite filling of the bomb.

Figure 11 - 1-kg. Thermite Incendiary Bomb