Wooden pipes were used in London and elsewhere in the course of the sixteenth and 17th centuries. The pipes were hollowed-out logs which were tapered on the end with a small hole during which the water would move by way of.[23] The a number of pipes were then sealed together with sizzling animal fat. Wooden pipes had been used in Philadelphia,[24] Boston, and Montreal in the 1800s. Built-up wooden tubes have been extensively used in the US during the twentieth century. These pipes (used in place of corrugated iron or bolstered concrete pipes) have been made from sections cut from short lengths of wood.