Description
Essentially, the Demolition Firing Device Mk 3 consists of an ordinary watch movement in which the hour hand is replaced by a cup which is slotted on the outside rim, a release mechanism which carries a bar that rides on the edge of the cup so that the release mechanism will operate as soon as the bar can enter the slot, and a firing pin. The device is waterproof to a depth of 20 feet. Time delay is adjustable up to 11 1/2 hours, with a minimum allowable setting of ten minutes. The luminous dial indicates the time remaining before the device fires; the luminous dot on the slotted cup coinciding with the number of remaining hours, and the luminous hand indicating the number of remaining minutes.
Functioning
No information about functioning.
Hazardous Components
No information about hazardous components.
See Also
Nothing else to see.
Source(s)
OP 1664, Volume 2 - US Explosive Ordnance (1947)
