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 217
144 Again, let us suppose that it is required by the zinc worker to make a mitre-joint at right angles in a half-round rain-water gutter, or trough. He will proceed geometrically as fol- FiG. 24. A B Fig. 25. … A lows : Let the semi-circle ABC (Fig. 24) rep- resent the sectional outline of the gutter. Draw the line a b, and draw the lines a f and
Sheet-metal work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
