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The Sheet metal worker's instructor : for zinc, sheet iron, copper, and tin plate workers, and others, containing a selection of geometrical problems, also practical and simple rules for describing the various patterns required in the different branches of the above trades (1906)

Warn, Reuben Henry · Philadelphia : Henry Carey Baird & Co. · leaf 242

An illustration from The Sheet metal worker's instructor : for zinc, sheet iron, copper, and tin plate workers, and others, containing a selection of geometrical problems, also practical and simple rules for describing the various patterns required in the different branches of the above trades, 1906, leaf 242
169 The last regular polyhedron is the icosahe- drori (Fig. 50), which is bounded by twenty equilateral triangles. For obtaining the " stretch-out " these may be arranged as shown at Fig. 51. Fm. 50 … All the preceding developments, if cut in card-board, scale-board, or thin metal, will, when their edges are brought together, assume the appearance of regular solids. Fig. 51. Although the equilateral triangle, the square, and the pentagon are the only figures from which can be formed regular…

Sheet-metal work

Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.

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