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IV. An instrument for cutting, grinding, and polishing section-plates and prisms of mineral or other crystals accurately in the desired directions

In a recent communication (‘Phil. Trans.,’ 1894, Series A, p. 887; 'Roy. Soc. Proc.,’ vol. 55, p. 108) the author described an instrument for grinding accurately orientated section-plates and prisms of crystals of artificial preparations. The success of that instrument is so complete that another instrument has been devised and constructed, upon similar principles, but with the necessary modifications and additions, to enable equally accurately orientated plates or prisms to be prepared from the relatively harder crystals of natural minerals.