[13] Some prominent examples of this brevity of treatment are in E. HOPPE, _Geschichte der Elektrizität_ (Leipzig, 1884); O. MAHR, _Geschichtliche Einzeldarstellungen aus der Elektrotechnik_ (Berlin, 1941); R. S. WHIPPLE, "The Evolution of the Galvonometer," _Journal of Scientific Instruments_ (1934), vol. 7, pp. 37-43; WILLIAM STURGEON, _Scientific Researches_ (Bury, 1850); A. W. HUMPHREYS, "The Development of the Conception and Measurement of Electric Current," _Annals of Science_ (1937), vol. 2, pp. 164-178. [14] M. SPETER, "Klärung der Multiplikator-Prioritätsfrage Schweigger-Poggendorf," _Zeitschrift für Instrumentenkunde_ (1937) vol. 57, pp. 29-32. [15] T. SEEBECK, "Über den Magnetismus der Galvanischen Kette," _Abhandlungen der Koenigliche Akademie der Wissenschaften zu Berlin_ (1820-1821), pp. 289-346. The phrase "Schweigger's multiplier" is used on page 319. The many experiments described in this paper added little or nothing to contemporary appreciation of the multiplier as an instrument. [16] J. S. C. SCHWEIGGER, _Journal für Chemie und Physik_ (1821), vol. 31, pp. 1-18, 35-42. Pages 1-6 are the paper presented in Halle on September 16, 1820; pages 7-18 are the paper presented in Halle on November 4, 1820, and pages 35-42 are "a few additional words." The preface to the whole volume is dated January 1, 1821. A somewhat earlier public announcement referring to Schweigger's discovery appeared in the _Allgemeine Literatur-Zeitung_ (November 1820), no. 296, cols. 622-624, but this was lacking in detail and seems not to have been noticed by any scientists. [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. [23] Op. cit. (footnote 8).