Origin, Method of extraction, Weight, Origin, Purifying Agent, Date Air, Hot copper, 2.31035, Air, Hot copper, 07/01/1892 Air, Hot copper, 2.31026, Air, Hot copper, 07/01/1892 Air, Hot copper, 2.31024, Air, Hot copper, 07/01/1892 Air, Hot copper, 2.31012, Air, Hot copper, 07/01/1892 Air, Hot copper, 2.31027, Air, Hot copper, 07/01/1892 Air, Hot iron, 2.31017, Air, Hot iron, 12/12/1893 Air, Hot iron, 2.30986, Air, Hot iron, 12/14/1893 Air, Hot iron, 2.31010, Air, Hot iron, 12/19/1893 Air, Hot iron, 2.31001, Air, Hot iron, 12/22/1893 Air, Ferrous hydrate, 2.31024, Air, Ferrous hydrate, 01/27/1894 Air, Ferrous hydrate, 2.31010, Air, Ferrous hydrate, 01/30/1894 Air, Ferrous hydrate, 2.31028, Air, Ferrous hydrate, 02/01/1894 Chemical, Iron and NO, 2.30143, NO, Hot iron, 11/29/1893 Chemical, Iron and NO, 2.29890, NO, Hot iron, 12/08/1893 Chemical, Iron and NO, 2.29816, NO, Hot iron, 12/05/1893 Chemical, Iron and NO, 2.30182, NO, Hot iron, 12/06/1893 Chemical, Iron and N2O, 2.29869, N2O, Hot iron, 12/26/1893 Chemical, Iron and N2O, 2.29940, N2O, Hot iron, 12/28/1893 Chemical, NH4NO2, 2.29849, NH4NO2, Hot iron, 01/09/1894 Chemical, NH4NO2, 2.29889, NH4NO2, Hot iron, 01/13/1894 Air, Hot iron electrified, 2.31163, Air, Hot iron electrified, 01/01/1894 Air, Hot iron electrified, 2.30956, Air, Hot iron electrified, 01/04/1894 Chemical, Electrified Iron and N2O, 2.30074, N2O, Hot iron electrified, 01/02/1894 Chemical, Electrified Iron and N2O, 2.30054, N2O, Hot iron electrified, 01/05/1894