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 area of the manor of Birmingham to the west of the town, is more suited to pastoral than arable agriculture and excavated animal bones indicate that cattle are the dominant livestock, with some sheep but very few pigs. Trade through Birmingham diversifies as a merchant class arises. While most manufactured goods in Birmingham are produced for a local market, there is some evidence that the town is already a specialised and widely-recognised centre of the jewellery trade during the medieval period. An inventory of the personal possessions of the Master of the Knights Templar in England at the time of