Catalogue ref: HS 7/49
A rat is skinned, the skin being sewn up and filled with P.E. [plastic explosive] to assume the shape of a dead rat. A Standard No. 6 Primer [this sets off the explosion] is set in the P.E. Initiation is by means of a short length of safety fuse with a No. 27 detonator crimped on one end and a copper tube igniter on the other end, or as in the case of the illustration above, a PTF with a No27 detonator attached. The rat is then left amongst the coal beside a boiler and the flames initiate the safety fuse when the rat is thrown on to the fire, or as in the case of the PTF a Time Delay is used.