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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 230

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 230
bisect (divide equally) any given straight line, as A B (Fig. 34) : Take the compasses, and v^^ith the centre Fig. 34. A, describe (that is, draw) the arc of a circle 2, 3. With the centre b and the same radius, de- scribe the arc 4, 5, cutting (or crossing the first arc at 6 and 7. Lastly, through… … A C B a line perpendicular to A b : With c as centre,

Sheet-metal work

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

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