RM Mines Used as Controlled Mines. A firing cable was led into the case through a stuffing box which replaced the clock pocket in the influence-fired model of each mine. The cable used was a four-conductor type with the two black and two white wires twis-ted together to make a double-conductor cable.

The two conductors were attached to two upper terminals on the mine terminal board, and the detonator leads, to the corresponding lower terminals. Two detonators and boosters were sometimes used, in which case the detonators were wired in parallel. A galvanized cable connector was used to stop the firing cable to a drogue eye on the cover plate.

Operation

1. Mine was armed manually prior to launching.

2. Mine was fired electrically by an observer.

3. No self-disarming devices were fitted.