Material of construction: Brass except for the steel firing pin threaded into the lower end of the striker.

Position and method of fixing in bomb: The fuze is screwed into the tail fuze pocket and tightened with a spanner wrench.

Components of explosive train: Incorporated in the Navy gaine.

Fuzes likely to be found with: A-3 (g), B-9 (a).

Delay times: Incorporated in the Navy gaine.

Threads: 12 threads per inch, RH, 1 15/16 inches in diameter.

Description: The body is of one piece brass construction. It is threaded at the top to receive a brass closing plate. The plate is pierced by two spanner holes and a central hole. A grub screw holds the closing plate in place.

There are six spanner holes in the outer circumference of the fuze body, slightly below the central portion. In the same plane as the spanner holes is a locating pin, staked in place, which extends through the body and engages a keyway in the striker body. There is an arming detent 180° removed and limited in its out-ward movement by the head of a screw threaded into the fuze body directly below the detent cavity.

The body is pierced longitudinally by two holes 180 degrees apart, one of which termi-nated in the outer end of the detent cavity. A U-shaped arming fork fits in these holes and bolds the spring-loaded arming detent inward so that it engages a hole in the striker body.

The heavy brass striker has a wide head which is cut by four vents. There is also longi-tudinal keyway which runs the entire length of the striker and accommodate the locating pin. At a 180° interval there is a hole for the arming detent. The striker rests on a spring which is in the central channel of the fuze body. The bottom shoulder of the striker channel is pierced by four vents. A groove cut in the bottom of the fuze body contains a steel locking spring which serves to hold the fuze firmly in the fuze pocket.

Operation: After the bomb has been released from the plane the fuze is armed by the pilot of the bomb. He operates a tail fuze arming mechanism which with-drawn the arm-ing fork far enough to allow the spring-loaded arming detent to move outward, disengag-ing the hole in the striker. The fuze is now armed. The striker is held away from the pri-mer by the spring. On impact the striker compresses the spring and hits the primer.

Figure 130 – B-10 (a) Bomb Fuze.