Descriptions of the 1935 model of the Tellermine and its fuze are given in Pamphlet No. 8. Since the pamphlet was published further details of the main detonator have become available and, as the result of further trials, the functioning load has been found to be subject to variation.

The brass body of the detonator, in the form of a cylindrical cup, is plated internally and has a plated brass flange soldered externally at the mouth. A cardboard washer carrying a washer of aluminium alloy, a closing disc of red paper and a fibre washer, all secured by a colourless adhesive, is fixed to the top of the flange.

The filling consists of 9.7 grains of T.N.T./C.E. 60/40 over which a brass inverted capsule is inserted with a 15.8 grain filling of mercury fulminate. A central hole in the capsule is closed on the inside by a disc of black gauze material. The body is closed at the mouth by another brass capsule, inserted base downwards. This capsule has a central hole and is lacquered.

The following loads, lower than those given in Pamphlet No. 8 have been arrived at:–

Load required to actuate fuze in the mine varied from 305 to 310 lb. The load requi-red is appreciably affected by the degree of airtightness of the fuze fitting and the amount of "slack" in the rubber skirting. The depression required was 4 mm.

Load required to actuate the fuze alone varied from 210 to 215 lb., with the three fuzes used in the test.