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
The Sheet Metal Worker's Instructor is a technical manual by Reuben Henry Warn, published in Philadelphia by Henry Carey Baird & Co. in 1906, teaching zinc, sheet iron, copper and tin plate workers geometric layout methods for patterns. The plates show plain line drawings of cones, cylinders, intersecting circles, and pattern developments with lettered points and construction arcs. A designer could take from them the clean geometry of pattern development, useful for folded forms, funnels, and radiating structures.
