1851 Great Exhibition: Official Catalogue: Class VI.: D. Y. Stewart and Co
238. STEWART, D. Y., CO, Glasgow, — Manufacturers.
Model of patent mould-making machine for cast-iron pipes.
Model of box or flask, in which the moulds are made.
Model of core carriage, with core bars upon it.
Pipes from 44 inches diameter downwards, cast in moulds made by the machine. Ten tons of pipes have been moulded m an hour.
Machine for testing the strength of cast-iron.
[In making hollow castings, an inner mould, of the exact contour of the intended hollow, is tamed in loam; it is, when dry, inserted in the sand-imprint of the pattern, the shape of the outside of the required casting. This inner mould is called the core, and when the casting has been made, is sufficiently friable to be easily broken away.— W. D. L. R]