English: Equilibrated skew arch bridge carrying the Bolton and Preston Railway over the Leeds and Liverpool Canal. Built in 1838 by Alexander James Adie to a logarithmic pattern proposed by mathematician Edward Sang three years earlier, the stone work is laid out very differently from the usual English helicoidal method. View of the intrados.
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{{Information |Description ={{en|1=Equilibrated skew arch bridge carrying the Bolton and Preston Railway over the Leeds and Liverpool Canal. Built in 1838 by Alexander James Adie to a logarithmic pattern proposed by mathematician Edward Sang three year