1851 Great Exhibition: Official Catalogue: Class VI.: Claudet and Houghton
From Graces Guide
306. CLAUDET and HOUGHTON, 89 High Holborn — Props. (Invented by A. CLAUDET.)
Machine for cutting round, square, and oval glass shades. The diamond being always kept on its cutting point by a spring and two castors, and being mounted on moveable apparatus, it is only necessary to push the apparatus slightly by the hand. With some modifications in the means of supporting the glass, but with the same apparatus for holding the diamond, this machine is used to cut the ends of the cylinders, which are the first form assumed by sheet glass.
Machine for cutting round shades exclusively.