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Nitric Acid: Chile Saltpetre Distilled with Oil of Vitriol in an Iron Retort
Nitric acid as commerce made it in 1912, from Thorpe's Dictionary: nearly equal weights of sulphuric acid and sodium nitrate (Chile saltpetre) distilled in a cast-iron retort. Keeping the condensed acid hot until it leaves the cooling worm keeps out nitrous acid; very strong sulphuric acid and melted nitrate give very strong nitric acid. The fused residue is sodium sulphate and disulphate. The vapour and fumes are poisonous: fume hood, respirator.
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