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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 227

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 227
iomboid (left-hand figure, Fig. 31) is a parallelogram having only the two opposite «ides equal and also the opposite angles equal. The trapezoid (centre figure, Fig. 31), has two parallel sides only, but may have some of the sides or some of the angles equal to each other or not. The trapezium… … trapezium, one of whose diagonals will divide it into a couple of unequal isosceles triangles (see A B, Fig. 31) is called a ti'apezion or kite. A polygon is a rectilinear or straight-lined figure, bounded by more than four straight lines. Polygons are sometimes called multi- lateral (or "…

Sheet-metal work

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

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