1851 Great Exhibition: Official Catalogue: Class IX.: Thomas Dean
From Graces Guide
4. DEAN, THOMAS, Wishaw, Scotland — Inventor.
Cutlery apparatus attached to a tile and pipe machine, for forming overlaps in tiles and pipes as they come through the die; intended to prevent the tiles or pipes from sinking in soft lands, and to keep them in one continuous line, so as to supersede collars. Two men and a boy can cut and make an average of 4,000 daily. The one pipe is cut out of the other, so that the overlaps are very complete in the fitting. The machine will be worked to exhibit the process.
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