Primers and Igniters for Initiating Mortar Propellants

Here primers and igniters are separate elements and not in one piece as for igniting proplnts in gun howitzer cannons, and in recoilless rifles. The weapons known as 60-mm Mortar Cannons M2 M19 arid 81-mm Mortar Cannons Ml M29 are smooth-bore. 

The red end must be assembled adjacent to the primer (Ref 42, p 86). Ignition cartridge is inserted into fin assembly ahead of the primer. The shaft, in turn, is screwed into the base of projectile, which is made either from pearlitic malleable iron or from steel. Propellant M9 [ See Vol 2, p C35, Table VI (Ref 44)] charge consists of several increments sealed in individual cellophane bags (usually four for 60-min mortars and up to nine for 81-mm weapons). The bags are placed either between or within the blades of fins. 

Primers and igniters for use in 81-mm Mortar Cartridges are of larger size and somewhat different in design. Several types are described in Ref 41, pp 85-8, and they are shown here in Fig 62 

Primer Percussion M7I is similar to M32 M34, except for the exterior shape which facilitates assembling into the hub of the fin of the HE cartridge or smoke cartridge. 

Its head, body and firing plug are made from aluminum alloy, while the closing disk is 

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