When the firer has returned from his mission, he should: _a._ Remove and discard the ignition cylinder, as follows: (1) Point gun at the ground. (2) Press latch. (Fig 14) (3) Unscrew the ignition shield and allow ignition cylinder to fall out. (Be careful to keep the hands away from the front of the cylinder.) (4) Save the partly used cylinder for training use or destroy it by firing from gun after fuel tanks have been emptied. For information on care, handling, and storage of cylinders, see Paragraph 31. _b._ Close the pressure-tank valve by turning valve handle clockwise (to conserve remaining pressure in pressure tank). _c._ Point the gun away from personnel and blow out the remaining fuel, if any, from the fuel tanks by squeezing the valve lever and grip safety until there is no further discharge. The trigger should not be used during this operation. _d._ Take off tank group from the back. _e._ Inspect, clean, and maintain the flame thrower (Pars 55 and 56) or, if experienced maintenance personnel is close at hand, turn the weapon over to them for servicing. _f._ After servicing, place the weapon in the packing chest (Par 77) for protected storage, or prepare it for the next mission. (Pars 50 through 53) Section VIII AUXILIARY EQUIPMENT 31. IGNITION CYLINDER. _a. Description and functioning._ (Figs 13 and 22) Either the M1 or E1 ignition cylinder may be used. It fits over the fore part of the barrel assembly and is revolved by the spring case. (Par 76) The five incendiary charges in the cylinder are spaced sufficiently far apart in the plastic body to prevent their igniting one another. Lead-foil seals, plastic closure plates, and waterproof cement make the unit comparatively waterproof. [Illustration: Fig 22. Cutaway view of ignition cylinder (M1 or E1).] _b. Action._ When the trigger rod is pushed forward, one of five metal matches tipped with red phosphorus scratches an igniting mixture. The ignition carries to a starter mix and to a few grains of black powder on top of the incendiary charge. The black powder blows the foil seal and closure plate clear of the flame thrower, and the incendiary charge ignites the fuel as it is discharged from the nozzle. The incendiary charge burns for from 8 to 12 seconds. _c. Packing._ Ignition cylinders are packed two per waterproof can. Three cans are furnished with each flame thrower. Fifty cans (100 ignition cylinders) are contained in each packing box of extra cylinders. _d. Care, handling, and storage._ Ignition cylinders contain hazardous incendiary material and must be handled with due care. The following precautions should be observed.