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Illustration showing the working spaces of a gas works, 1828: l: Retort House. 2: Tar cistern. 3: Condenser. 5,6: Gasholder. 7: Office. 8: Workshops. aa: Pipes connecting tar cistern to hydraulic main.b, Pipe connecting a,a, and condenser. From 'The Oxford Encyclopaedia', Oxford, 1828. (KEYSTONE/HERITAGE IMAGES/Ann Ronan Pictures)