The sheet-metal worker's guide : a practical handbook for tinsmiths, coppersmiths, zincworkers, etc., comprising numerous geometrical diagrams and working patterns, with descriptive text (1888)
Crane, W. J. E. (W. J. Eden) · London : Lockwood and Son · leaf 66
54 THE SHEET-METAL WORKEr's GUIDE. The octahedron, or " eight -sided figurie (a, Fig. 47), is composed of eight equilateral triangles, as shown. One face, c d e, having been constructed in the usual manner, the other seven Fig. 50. sides are subsequently added, as shown at Fig. 47. (One face has… … Fig. 51. this solid are composed of twelve regular pen- tagons (or five-sided '^) figures, and it is hence necessary to construct a pentagon according to any approved method, and then form others on its sides in the manner shown at Fig. 49.
Sheet-metal work
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