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 190
117 and it is then finished by a punch or top tool (Fig-. 11) matching the groove in the crease. Joints. Let us now glance at the various methods of making joints at angles of sheet metal, as at Fig. 12. A and b are for the thinnest metals, such as tin, which requires a film of soft solder on one… … F is folded by means of the hatchet-stake.
Sheet-metal work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
