Fig. 1: Samuel Clegg's (1781-1861) gas apparatus (1808). : B. Cook's gas apparatus. Figs 8&9: Furnace for producing tar as gas by-product. Hand-coloured engraving from 'Encyclopaedia Londinensis', London, 1814

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Fig. 1: Samuel Clegg's (1781-1861) gas apparatus (1808). : B. Cook's gas apparatus. Figs 8&9: Furnace for producing tar as gas by-product. Hand-coloured engraving from 'Encyclopaedia Londinensis', London, 1814

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