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George Forrester, the eminent engineer of Liverpool, also had a patent September 1831, in which he proposed to unite cast with wrought iron, by a very ingenious and beautiful process, especially with the view of constructing the wheels of railway carriages.
The specification informs us, that there is first to be made a skeleton, or light frame of wrought iron or steel, of the form required, but of considerably less thickness. This skeleton is to be brightened by grinding, scouring or filing, so as to adapt it to be tinned. The article to be cast having been moulded its sand or loom, in the common way, the tinned skeleton is carefully laid its the middle of the respective parts of the mould, projecting pieces being attached to the former, to keep it in its proper place: the mould is now to be closed, and the cavities focussed by the pattern are to be filled up with fluid cast iron, which completes the operation.