5230519 Vacuum-pan at Messrs Finzel\'s Works, will boil about 300 Tons a week (engraving) by English School, (19th century); Private Collection; (add.info.: Vacuum-pan at Messrs Finzel\'s Works, will boil about 300 Tons a week. Illustration for The Practical Magazine, Volume II, 1873.); Look and Learn / Illustrated Papers Collection; English, out of copyright.