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Phosphor-Tin: Sponge Tin and Stick Phosphorus Layered in Charcoal and Heated in a Sealed Crucible (Berthold, US 658,230)
Phosphorus is hard to get into bronze without fire and fumes. Berthold packs sponge tin and sticks of phosphorus in layers of charcoal in a sealed crucible; as it heats, the tin melts and soaks up the phosphorus.
Result: phosphor-tin with about 10 % phosphorus, ready to add to molten copper.
Source: Berthold, US 658,230 (1900). Danger: white phosphorus is poisonous and catches fire in air. Picture drawn by Youblob.
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