The projectile for the 45 mm Brixa mortar, Model 35 is 0.465 kg (1 lb.) streamlined bomb, having a cylindrical steel body (1) with a rounded head (1a). A conical aluminium tail (2) with four vanes (2a) is screwed into the rear end of the body. The tail and vanes are painted red.

The bursting charge (21), consists of 70 grams (1080 grains) of a T.N.T.-dinitritronaph-talene mixture in a compressed block, is housed partly in an aluminium container (4) and partly in the tail (2). The container (4) is surrounded by a flat-section coiled spring (5), which is probably intended to increase fragmentation, and its front end rests against a steel disc (7).

The fuze comprises a fuze body (8), striker-pin (15), graze pellet (25), detonator (16) and a creep spring (17).

The fuze is provided with two safety devices, one for ensuring safety during storage and the other for ensuring safety in flight.

The device for ensuring safety in storage consists of a brass safety pin (3) which ex-tends transversely through apertures (1b) in the head (1a) of the body and through si-milar apertures in the fuze cap (20). This brass pin separates the striker-pin (15) from the graze pellet (25) and prevents arming of the fuze until it is withdrawn by means of a ring (23).

The device for ensuring safety in flight comprises a rotor (11) and a pin (13), which is mounted in the fuze body (8) by means of a stirrup spring (14), so that its point engages in the rotor. When the projectile is discharged, the pin (13), owing to inertia, overcomes the resistance of the stirrup spring (14) and moves back, freeing the rotor (11), which is immediately caused to rotate by the air flowing past the nose of the fuze, thereby un-screwing itself from the screw-threaded stem (15a) of the striker-pin and causing the point of the striker-pin to project through the hole in the diaphragm (18) to the striker-pin sleeve (9). The arming of the fuze in this way is not, however, completed until the projectile has travelled about 10 yards from the muzzle of the mortar.

In an earlier model of this projectile, the container (4) is  made of brass instead of alumi-nium, and the graze pellet is in one piece, i.e., without any closure cap.

Fig. 24