. Bulletin. Science. than of physical contact,^^ and Antoine Becquerel had devised another such celF'' in the 1820's as a result of Davy's theories. Daniell set out to test Faraday's electrochemical theories, and he devised his nonpo- larizable "Constant Battery" on the results (figs. 15, 16, and 17). In Daniell's cell an amalgamated zinc electrode in a weak solution of sulfuric acid was separated by an ox gullet from a copper electrode in a copper .sulfate solution. John Gassiot made a more durable cell by replacing the gullet by an unglazed f;,,j. SmJ^ O'lliA-V Ir ,1 /ill Figure 15
. Bulletin. Science. than of physical contact,^^ and Antoine Becquerel had devised another such celF'' in the 1820's as a result of Davy's theories. Daniell set out to test Faraday's electrochemical theories, and he devised his nonpo- larizable "Constant Battery" on the results (figs. 15, 16, and 17). In Daniell's cell an amalgamated zinc electrode in a weak solution of sulfuric acid was separated by an ox gullet from a copper electrode in a copper .sulfate solution. John Gassiot made a more durable cell by replacing the gullet by an unglazed f;,,j. SmJ^ O'lliA-V Ir ,1 /ill Figure 15.—Daniell's "constant" battery. From Philosophical Transactions of the Royal Society oj London, 1836, vol. 126, p. 117, pi. 9. porcelain cylinder.^^ While the high internal resist- ance of the Daniell cell limited the current consider- 26 Humphrey Davy, "An Account of Some Galvanic Combi- nations, Formed by the Arrangement of Single Metallic Plates and Fluids, Analogous to the New Galvanic Apparatus of Mr. Volta," Philosophical Transactions, 1801, vol. 91, pp. 397-402. 2' Antoine Becquerel, "Nouveaux Resultats electro- chimiques," Annates de chimie et de physique, 1823, vol. 23, pp. 259-260; "De 1' Etat de I'electricite developpee pendant les actions chimiques, et de la mesure de ces dernieres au moyen des effets 61ectriques qui en resultent," Annates de chimie et de physique, 1823, vol. 24, pp. 192-205; "Memoire sur I'electro- chimie et I'emploi de I'electricite pour operer des combinai- sons," Annates de chimie et de physique, 1829, vol. 41, pp. 5-45. 28 John P. Gassiot, "Account of Experiments with Volta- meters, Having Electrodes Exposing Different Surfaces," London and Edinburgh Philosophical Magazine and Journal of Science (title varies, hereinafter referred to as Philosophical Magazine), 1839, vol. 13, pp. 436-439. 242 BULLETIN 228: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY. Please note that thes
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