[17] P. ERMAN, _Umrisse zu den physischen Verhältnissen des von Herrn Prof. Oersted entdeckten elektro-chemischen Magnetismus_ (Berlin, 1821). Hoppe (footnote 13) states that Erman's book was published in May; however, it is referred to in a letter dated April 3, 1821, by RASCHIG, _Annalen der Physik_ (1821), vol. 67, pp. 427-436.
[18] Op. cit. (footnote 16), vol. 32, pp. 38-50.
[19] _Annalen der Physik_ (1821), vol. 67, pp. 382-426, and footnote on pages 429-430 of same volume. The footnote accompanies the article by Raschig mentioned in footnote 17.
[20] H. C. OERSTED, "Sur le Multiplier electro-magnetique de M. Schweigger, et sur quelques applications qu'on en a faites," _Annales de Chimie et de Physique_ (1823), vol. 22, pp. 358-365.
[21] "Versuche mit dem electrisch-magnetischen Multiplicator," _Annalen der Physik_ (1821), vol. 67, pp. 427-436.
[22] _Transactions of the Cambridge Philosophical Society_ (1821), vol. 1, pp. 269-278.
[24] The German word _Kette_ has been translated as "circuit" throughout. Although the equivalence of these words is clear, for example, in Ohm's work of 1826, the context in which _Kette_ is sometimes used in 1820 and 1821 indicates that the concept of a "circuit," in the sense of the wiring external to the source of electricity, has not been established. The wiring is regarded more as something incidental, used to "close" the cell, the cell being considered essentially the whole of the apparatus. This view underlies the many attempts to correlate the Oersted phenomena with cell materials and design, and with the use of such terms as "chemical magnetism" by Erman and others.
[25] The reference here is to the Oersted-type experiments described in two papers by authors other than Schweigger on pages 19 to 34 of the volume.
[26] Op. cit. (footnote 19), pp. 422-426.
[27] One "line" seems to have been about 1/12 inch.
[28] J. G. POGGENDORF, "Physisch-chemische Untersuchungen zur näheren Kenntniss des Magnetismus der voltaischen Säule," _Isis von Oken_ (1821), vol. 8, pp. 687-710. Most of Poggendorf's numerical data is also in C. H. PFAFF, _Der Elektromagnetismus_ (Hamburg, 1824), along with some of Pfaff's own work.
[29] Reported in _Annales de Chimie et de Physique_ (1820), vol. 15, pp. 222-223.