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These were signals to the crabs to notify them that a motor-gun had been discharged, and thus to provide against accidents in case a bomb should fail to act. One puff signified that a bomb had been discharged to the north; two, that it had gone eastward; and so on.

It is true that in case of the failure of a bomb to act, another bomb would be dropped upon the same spot, but the instructions of the War Syndicate provided that every possible precaution should be taken against accidents. Of course the Vice-Admiral did not understand these signals, nor did he know that they were signals, but he knew that they accompanied the discharge of a motor-gun.

The German military Zeppelin L-Z-77 was brought down by a French incendiary shell from a 75-millimeter antiaircraft gun of the motor-gun section of Rénigny in the neighborhood of Brabant-le-roi, on February 21, 1916. This airship was hit by an explosive shell which ignited the gas bag and caused an explosion of the bombs, so that it was completely wrecked and fell in flames.

The improvised motor-gun has not proved a complete success, except in those instances when the hostile aircraft has ventured to approach somewhat closely to the ground.