There is a section on how to make them in the City & Guilds plumbing book,
which my local library used to carry. There is also a display about lead and
how it is used in building at the Weald and Downland Open Air Museum
northish of Chichester in West Sussex.
Much roofing lead is primary lead, not recycled. To make ductile sheet
it's important that the alloy is pure and low in antimony. Scrap lead,
unless it's clean roofing or gaspipe, is full of antimony that was
either added as a hardening agent, or was just ignored in cast
"ballast" lead. Given the relatively low cost of lead these days it's
cheaper to use primary lead than to refine the scrap well enough for
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