Smoke Generator No. 6 Mks I and II (Service)

Description: The generator consists of a cylindrical metal body containing smoke composition, a plugged adapter containing igniter composition in a metal foil cup, a quan-tity of priming composition, and a lenght of quickmatch. When prepared for sue, a per-cussion igniter replaces the adapter plug. A tail unit is formed integrally with the body, and the upper end of the body is closed by a lid. The igniter consists of an igniter body, a striker supported above the cartridge base by a shear wire, and a safety pin. The cart-ridge base includes a small quantity of cap composition located between a percussion cap and an anvil.

Functioning: The safety pin is removed just before the generator is dropped. On im-pact the striker moves downwards, breaks the shear wire, and fires the cap composition in the cartridge base. The flash from the cap composition ignites the quickmatch, which, in turn, ignites the priming composition in the adapter. The priming composition ignites the igniter composition, which then ignites the smoke composition. The heat due to the smoke composition loosens the metal disc covering the smoke-emission holes in the top lid, and the pressure of the smoke forces the discs off the top lid, allowing the smoke to escape to the atmosphere.

Remarks: The smoke generator is designed to be dropped from an aircraft to enable the pilot to ascertain the direction of the wind on the ground before making an emergen-cy landing.

Figure 102 - Smoke Generator No. 6