Copy of the Specification of a Patent, Granted to William Chapman, of Murton-House, in the County of Durham, Civil Engineer, and Edward Walton Chapman, of Willington-Ropery ...: Rope-maker, (dated the 30th Day of December, 1812.) for Their Invention of "a Method, Or Methods, of Facilitating the Means, and Reducing the Expence of Carriage on Railways and Other Roads."