National Geographic : 1920 Feb
WITH THE LITTLE SUB-CHASERS ROLLING HEAVILY IN EVEN THE SLIGHTEST SEA, THE ORDINARY RIFLE WAS FOUND MORE SUCCESSFUL THAN THE MACHINE-GUN FOR SINKING THE FLOATING MINES WHICH WERE CUT UP BY THE SWEEPERS When the mine is struck a metallic ring is heard, much the same as in a target gallery. If thebullet misses, asmall spout of water isthrown up where it strikes. The small float which supports the antenna of the mine can be seen to the left of the mine itself. The bullets open holes in the mine, which soon fills with water and sinks to the bottom.