DESCRIPTION. The body is made of aluminum, and has a wall of two thickness which forms a shoulder. On this shoulder rests the distance tube to prevent longitudinal move-ment of the coiled part of the pull wire. (See fig. 251.) This pull wire passes through the friction composition contained in a cap which is held in position by the rubber retaining plug. Screwed to the other end of the igniter body is the adaptor which is also threaded externally to screw into the handle of the stick grenade. The delay composition consists of black powder which gives a delay of 7-seconds. This delay composition is covered with the small quantity of flash producing composition and the whole filling is protected by the green cellophane disk which is secured in position by the rubber washer.

OPERATION. The coiled part of the pull wire is attached to a cord located in the hollow handle of the stick grenade, is drawn through the friction composition which ignites. The resultant flash passes up the distance tube to ignite the delay composition which burns for 7-seconds before igniting the flash composition which in turn ignites the ignition mix-ture in the ignition tube No. 4 to bring about the ignition of the smoke composition in the head of the grenade.

Figure 251 – BZ-39 Friction Igniter Pull Type