grasping the canister with the right hand (Fig. 130-2). Examine the canister for rust spots and weak places by pressing lightly with the fingers, beginning at the bottom and working toward the top; see that its contents do not rattle on shaking; see that rain shield is not loose and that the inlet valves are present.

THREE. Adjust the mask to the face. Then pinch together the »alls of the hose just above the canister nozzle and inhale (Fig. 130-3).

Fig. 330.—Mask inspection by the number«. 0) Position ut ihe i-ommand MASK (2) Inspecting the canister ut the command TWO, (3) Tenting for lent* at the command THREE.

If air can be drawn in, a leak is present, and its approximate location may Ik« determined as follows: Pinch the walls of the hose together at the angle tube. If a leak is no longer detected on inspiration, the leak is in the hose; otherwise it is elsewhere. This ins|>cction is not conclusive as to the absence of a leak in the hose, and such a leak will be determined by the minute inspection indicated below. If the leak is found not to In» in the hose, then pinch together the outlet valve at the angle tube and also the hose. If the leak is no longer detected on inspiration, the leak is in the outlet valve below where it was pinched; otherwise it must be above this point or in the facepiece. Having determined the approximate location of the leak, or its absence, next examine the hose for obvious

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