2 4 6 D O C . 1 5 2 O R I G I N O F G E O M A G N E T I C F I E L D
Akad d. W. XVII 1923. Gl. (6) und (15).” The reference is to Weyl 1923a and Einstein 1923n
For a derivation of this equation, see Doc. 31. A similar equation also appears in Doc. 89.
From this word on, the remainder of the text is written in Hermann Mark’s hand.
Only one page of the manuscript is extant. Mark later recollected: “The manuscript page (started
by Einstein and continued by me) is the beginning of the draft for a paper which was never published
because a series of experiments which I carried out in 1923 at Einstein’s suggestion did not give any
conclusive results. I do not know where the following pages are; as far as I can remember, this draft
was about three to four handwritten pages long” (see Hermann Mark to Peter Bergmann, 11 April
1967 [17 080]).