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Sectioned Switch No.10 Time Pencil.
INERT Switch No.10, Time Pencil. Widely used by SOE and special forces this delay action fuze was used in conjunction with a detonator or Bickford cord to set off explosives. This example has a red safety strip indicating a 30 minute delay. The pencil was initiated by crushing the copper tube that shrouds a glass ampuole containing corrosive liquid. This example has been sectioned to show the inner workings but is missing the acetone ampoule. This example in good condition with some crushing to the copper sleeve that covered the ampoule.