48. - Lapidaries employ wooden wheels in smoothing soft and rounded stones. The wheels consist usually of beech, birchwood, or mahogany, cut out plankways, fixed on the spindle and turned flat. The wood wheels are fed with flour emery and water, as described under the article in this Catalogue on Alabaster.

49. - Glass Cutters employ the edges of similar wheels with pumice-stone and water for smoothing, and with putty and water for polishing; the edge of the wheel is turned flat, angular or circular, according to the fashion of the work. Willow, poplar or alder, which are amongst the softest of our woods, are much used for the glass cutters' wheels: their face wheels, which are far less common, are mostly thick transverse sections of the tree, and consequently the grain is then upright at every part, and both more equable and durable.

50. - Cutlers use wood wheels under the name of glazers; these should be constructed of two layers, each consisting of 6, 8 or more pieces with the grain radial, so that the periphery may be entirely formed of the end grain of the wood; walnut, oak, crab-tree, birch and mahogany are severally used, but the latter is on the whole the best. The cutlers' wood or glaze wheels are mostly fed with emery cake, already described, and which is applied whilst the wheel slowly revolves.

The edges of glazers are occasionally scored with a pointed knife, to enable the emery cake to penetrate, and for fine work, they are also boul-dered down with a flint, or other hard and smooth stone, and waxed to render the edge smooth, just in the manner recently explained in reference to cutlers' laps. Sometimes a wood wheel fed with emery and oil is first used, and afterwards a wood wheel with emery and wax.