1000 ton 'Serck' Type Vertical Extrusion Press, view taken on site, with extruded copper tubes, O/No. 56100, c.1957

Order 56100 for Birmingham Battery, c.1957

D7338/14/5/8/5092
Gloucestershire Archives
D7338/14/5/11/5575
Gloucestershire Archives

The thick-wall extrusions illustrated were known as ‘tube shells’ and were processed into thin-wall tubes to the sizes used in domestic heating systems by means of ‘drawing’, or pulling, the tubes through a series of reduction dies until the final drawn size was achieved. Naturally, the length increased with each drawing operation.

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