METHOD OF USING CANVAS TRENCH FANS 86. (a) CLEARING fan blade is placed on the ground with the brace side downwards, the man using it being in a slightly crouching position with the left foot advanced, the right hand grasping the handle at the neck and the left hand near the butt end.  The fan is brought up quickly over the right shoulder, and then smartly flicked to the ground.  This drives a current of air along the earth and, on the top strokes, throws the gas out of the trench.  The part of the fan blade nearest the handle…
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