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Knight's Mechanical Encyclopedia (ed. Knight) 4 0 Browse Search
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hombal head, used for some purposes. The acute angles of the rhomb are sometimes made to clinch. Di′a-mond-plow. A small plow having a moldboard and share of a diamond shape; that is, rhomboidal. One side of the rhomb runs level on the ground, another forms the breast, and the other two are the marginal lines of the backward extension of the mold-board. Di′a-mond-point. A stylus armed with a diamond, either ground conical or made of a selected fragment of the desired shape. Wilson Lowry introduced the diamond-point into engraver's rulingmachines. Etching-tools have been pointed with diamonds. Diamond-points are used in ruling the graduation of the finer kinds of instruments, also by Nobert, it is supposed, in ruling the wonderful series of lines that form the tests of the microscopes of higher powers. Diamond-point chisel. Di′a-mond-point Chis′el. A chisel whose corners are ground off obliquely. Di′a-mond-tool. (Metal-working.) A metal-turning to
0) consists of an arm a secured to the ruler-bar in such a way that the distance between the holders composing the set may be varied. The other end has a pair of jaws, between which a double pen b is secured by a set-screw. Above, and hinged to the arm a, is a second sliding-holder c, which may be held fast by the set-screw d. This receives a single pen e. The distance between the pens b e is varied by means of a set-screw f. Ruling-machine pen. 2. (Engraving.) The invention of Wilson Lowry. This consists of a carriage traveling in a groove or on a bar, and carrying a diamond-pointed stylus, which makes a line through the ground covering the plate. The line being drawn, a thumb-piece lifts the stylus, and the carriage is retracted. Then, by a lever arrangement, the carriage track is shifted laterally the distance between two lines. This distance is regulated according to requirements for wide or narrow ruling, and when set, the distance is preserved until the job is fini