Fuzes: Nose: A-3 (a); tail: D-2 (a).

Over-all length: 71 inches.

Length of body: 40 inches.

Diameter of body: 12 inches.

Thickness of wall: 1/4 inch.

Material of wall: Steel.

Type of suspension: Horizontal.

Suspension lug: Normal Navy suspension lug.

Color and markings: Gray over all. Silver nose tipped with green. Red tail struts.

Length of tail: 31 inches.

Width of tail: 12 inches.

Width of tail fins: 5 1/4 inches.

Dimensions of tail struts: Width, 2 inches.

Material of tail: Sheet steel.

Type of filling: Incendiary filling: 750 (approximate) steel cylinders containing an incendi-ary mixture.

Barium nitrate: 35.8 percent.

Iron oxide: 27.2 percent.

Aluminum powder: 13.6 percent.

Magnesium shavings: 10.3 percent.

Synthetic shavings: 13.1 percent.

Dimensions of cylinders: Length, 2 3/4 inches; width, 1 1/16 inches; thickness, 1/8 inch.

Packing of cylinders: The cylinders are packed in circular rows in nine perforated nitrocel-lulose containers.

Burster charge: Two burster charges are contained in the nose piece and in the tail cone. The explosive is also scattered throughout the interstices of each incendiary sec-tion. The composition of the charge is:

Barium nitrate: 75.2 percent.

Aluminum powder: 24.2 percent.

Oil: 2 percent.

Note. - Perforated steel plates in the nose and tail separate the burster charge and the incendiary filling.

Weight of filling: Burster charges, 73 pounds; incendiary filling, 300 pounds.

Total weight of bomb: 550 pounds.

Construction of body: A cast-steel nose is welded to a tubular-steel body by a conti-nuous weld and a row of 12 plug welds. The tail cone is held by 1 row of 18 plug welds a continuous weld to a collar which is held in the base of the bomb by 2 rows of round-headed screws, 20 in each row.

Construction of tail: Four steel fins are welded at an angle to the tail cone. The fins are braced at the juncture with the tail cone by a steel strip welded to the underside of the bent fin and the cone. At the after end the fins are braced by two sets of box-type struts. The angle of the fins imparts a counter clockwise rotation in flight to the bomb.

Operation: The aerial burst fuze functions at a preset height. The detonation of the burster charges ignites the inflammable trays and the incendiary cylinders and ruptures the bomb case. The fragments are scattered over a 175 yard radius when airburst oc-curs 100 feet above ground.

Figure 53 - Type 2 No. 25 Mk 3 Bomb Model 1.