Note 17 — Contributions from The Museum of History and Technology: Paper 38 The Earliest Electromagnetic Instruments
Reading edition
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.