British Army uniform and equipment in World War I It contained an inner can of explosive with an outer can of metal fragments or ball bearings. The fuses that were developed for the Jam Tin Grenade were activated by friction or a by lighted taper which was often replaced by a lighted cigarette. This was followed by the highly successful Mills bomb in 1915. It was oval in shape to fit into a clenched fist and time fused. The detonator was activated by a spring driven firing pin which was restrained by a lever that in turn was locked by a safety pin. The Mills bomb was a defensive
History of trade and industry in Birmingham smiths are mentioned on a poll tax return of 1379 and seven more are documented in the following century. Although fifteen to twenty weavers, dyers and fullers have been identified in Birmingham up to 1347, this is not a significantly greater number of cloth-workers than that found in surrounding villages and at least some of the cloth sold on the Birmingham market had rural origins. This was the first local industry to benefit from mechanisation, however, and nearly a dozen fulling mills exist in the Birmingham area by the end of the 14th century, many converted from corn mills, but