OFFENSIVE AGAINST U-BOATS
A depth charge does not work like a bomb exploding in the air, for the destructive force is exerted not only outward. The explosion compresses the water everywhere within a radius of 70 feet, thus exerting fatal pressure also on the far sides of the submarine, as shown above. See "Thunder Afloat" at the Regent Theatre to-night.
A disabled submarine, lying on the bottom, is silent, but position is deduced by bubbles, oil slick and direction of current. The drag or trailer is a bronze plate, which set up a current when it touches metal. When position is fixed the destroyer drops charge. Bee "Thunder Afloat" at tho Regent Theatre to-night.
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Manawatu Times, Volume 64, Issue 297, 16 December 1939, Page 2
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114OFFENSIVE AGAINST U-BOATS Manawatu Times, Volume 64, Issue 297, 16 December 1939, Page 2
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