Plate from 'Specification of John Birkenshaw's patent for an improvement in the construction of malleable iron rails', 1824. The locomotive shown is of the type patented by George Stephenson and William Losh on 26th November 1816. The principal feature of the patent, no 4067, was the steam springs. In 1820, John Birkenshaw rolled the first malleable iron rails made under his patent at the Bedlington Iron Works, Northumberland, of which Michael Longridge was proprietor.
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