Type B Depth Charge (UK)

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Type A, B and E Depth Charges[1]

The British Type B Depth Charge was an early, small antisubmarine weapon adapted from the "Vernon boom" described in the Annual Report of the Torpedo School, 1915.[2]


The Type B was similar to the Type A Depth Charge, but by discarding the heavy outer chassis float in the original model in favour of a "fisherman's float", 40 pounds (19%) were saved from the overall weight. As it had the same 32.5 pounds of gun cotton initiated by a G.C. primer of 2.25 pounds, this gave the Type B an explosive weight of 15th the overall weight – not great but a big improvement. Vernon calculated that this gave the weapon a 10 foot danger radius.

As in the Type A, explosion was triggered mechanically by a float and wire system. The single depth setting of 40 feet used in the Type A was augmented by an 80 foot setting which could be selected by withdrawing a pin before dropping the charge. The Type B was in general use by small craft in October 1915.

The final refinement on the Vernon boom-derived depth charges would be the Type E, which greatly increased the proportion of explosive comprising the overall weight.

See Also


  1. Annual Report of the Torpedo School, 1915. Plate 82.
  2. Annual Report of the Torpedo School, 1915. pp. 164-5, 172, Plate 73, Plate 82.