Nitrous Oxide Gas Apparatrus. Leather covered, or mahogany case, Fig. 972. Gasometer's for Liquid Gas (Barth's), Fig. 973. Page 331.

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Credit: Nitrous Oxide Gas Apparatrus. Leather covered, or mahogany case, Fig. 972. Gasometer's for Liquid Gas (Barth's), Fig. 973. Page 331. . Wellcome Collection. Source: Wellcome Collection.