objectSheet MetalObjectsA named craft tool / part lemma (Sheet Metal) drawn as an exact public-domain workshop phrase.Sheet Metal is historically related to Workshop.copper-work seats orphan sheet-metal beside workshop as a first craft peer — object speech, not a text-container or tradition dump.from Augustus F. Rose · Copper Work: A Text Book for Teachers and Students in the Manual Arts, PD Gutenberg #41851historically related to · sourced · documentedsourcesCopper Work: A Text Book for Teachers and Students in the Manual Arts · Augustus F. RoseRose, Copper Work (PD Gutenberg ed.).