Canning novelty. Early methods of manufacture employed poisonous lead solder for sealing the cans. Studies in the 1980s attributed the lead from the cans as a factor in the disastrous outcome of the 1845 Franklin expedition to chart and navigate the Northwest Passage. Later studies found this to be false. Increasing mechanization of the canning process, coupled with a huge increase in urban populations across Europe, resulted in a rising demand for canned food. A number of inventions and improvements followed, and by the 1860s smaller machine-made steel cans were possible, and the time to cook food in sealed cans had
Field ration quantities of food in cylindrical tin cans to be divided up on preparation, rather than individual retort pouches or packets. Even dry materials like sugar or biscuits are often packed in these cans. They contain ingredients for baking bread and tinned food, including vegetables, corned beef and sausages in lard. Also included are chocolate, pre-cooked chicken or beef in gravy and soya mince. Ten boxed one-man ORPs are supplied in larger boxes identical in shape to the single ten-man pack. The Mark 4 EFR is designed for crews of fast jets. It consists of a flat tin it contains 100