3 6 D O C U M E N T S 1 4 – 1 6 A P R I L 1 9 2 3
14. From William W. Campbell
lickobservaory calif [12 April 1923]
= three pairs australia tahiti eclipse plates measured by campb[ell]
sixty two to eighty four stars each five of six measurements completely calculated
give einstein deflection between one point fifty nine and one point eighty six sec-
onds arc mean value one point seventy four
Tgm. [8 323]. Addressed “einstein akademie wissenschaften berlin,” with secondary postmark “Ber-
lin NW 12.[4.]23.
Campbell (1862–1938) was director of the Lick Observatory in Berkeley, California.
The plates were taken in September 1922 by an expedition to Wallal, Western Australia, to
observe light deflection by the Sun during a solar eclipse. Robert J. Trumpler (1886–1956), an astron-
omer from the Lick Observatory, had made the comparison plates three months earlier on Tahiti. See
Campbell and Trumpler 1923 for a first publication of the results; see also Crelinsten 2006, pp. 194–
212, for more on the expedition.
The value predicted by general relativity is 1.7 seconds of arc (see, e.g., Einstein 1916e [Vol. 6,
Doc. 30], p. 822).
The first and middle name initials are added in an unknown hand.
15. From Edith Clare Bryce Cram
[New York, 12 April 1923]
congratulations on your stand for
would you come to america as guest
of two peaces societis if expenses were paid aeswer colclub = cram
Tgm. [43 464]. The telegram is addressed “Professor Albert Einstein Haberlandstr 5 Berlin w 30” and
postmarked “Berlin W 30 12.4.23 10–11V[ormittags].”
Cram (1880–1960) was founder of the Peace House in New York.
Einstein had recently expressed his displeasure with the League of Nations following the French
and Belgian invasion of the Ruhr (see Einstein to Pierre Comert, 21 March 1923 [Vol. 13, Doc. 447]).
16. From Ludwik Silberstein
[Rochester?] 15 April, 1923.
Lieber Herr Kollege!
Beinahe ein Jahr waren mir Ihre terrestischen Koordinaten unbekannt; ich hörte
blos, dass Sie Berlin verlasssen haben (to judge from the newspapers). Direkt habe