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Einstein, Albert, 1879-1955. Autograph letter signed : Prague, to Erwin Finlay Freundlich, 1912 Jan. 8.

Title: Autograph letter signed : Prague, to Erwin Finlay Freundlich, 1912 Jan. 8.

Discussing light deflection at length. Stating that Einstein is very glad that Freundlich embraces the matter with such enthusiasm and expressing curiosity to learn what results Freundlich will obtain from examining the photographic plates, and emphasizing that this is a matter of fundamental importance. Noting that from the theoretical point of view it is quite probable that the effect actually exists, stating that if Freundlich could manage to conduct daylight observations on fixed stars close to the sun, then we could soon know more, and inquiring as to whether Freundlich calculated how low the density of the Sun's atmosphere needs to be in order to see the fixed stars through it. Mentioning that a very light density causes a deflection of light, and further discussing the topic, referring to his own work. Asking Freundlich to keep Einstein up to date on his research.

ArchivalResource: 1 item (2 p.) ; 17.3 cm.

http://www.worldcat.org/oclc/502419852 View

Papers of Erwin Finlay Freundlich, ca. 1906-1958

Title: Papers of Erwin Finlay Freundlich ca. 1906-1958

ArchivalResource: 7 boxes plus 1 volume

http://archiveshub.ac.uk/data/gb227-ms37003-37008 View

Einstein, Albert, 1879-1955. Autograph letters signed (25) : Prague, Zurich, and Berlin, to Erwin Finlay Freundlich, 1911 Sept. 1-1931 Sept. 10 (bulk 1911-1921).

Title: Autograph letters signed (25) : Prague, Zurich, and Berlin, to Erwin Finlay Freundlich, 1911 Sept. 1-1931 Sept. 10 (bulk 1911-1921).

ArchivalResource: 25 items (ca. 47 p.)

http://www.worldcat.org/oclc/270870720 View

Emergency Committee in Aid of Displaced Foreign Scholars. Emergency Committee in Aid of Displaced Foreign Scholars records. 1927-1949.

Title: Emergency Committee in Aid of Displaced Foreign Scholars records

The Emergency Committee in Aid of Displaced Foreign Scholars was formed in New York City in 1933 by American academicians for the purpose of employing refugee German scholars in American institutions. Many of these refugee scholars were Jews displaced by the National Socialist government. The collection consists chiefly of grant files on refugee scholars who applied for aid from the Committee. The records also include correspondence with other refugee and philanthropic organizations and with the educational institutions which accepted refugee scholars.

ArchivalResource: 98.46 linear feet (222 boxes)

http://archives.nypl.org/mss/922 View

Einstein, Albert, 1879-1955. Autograph letter signed : Prague, to Erwin Finlay Freundlich, 1911 Sept. 1.

Title: Autograph letter signed : Prague, to Erwin Finlay Freundlich, 1911 Sept. 1.

Thanking Freundlich for his letter, in which he laid out an interesting question, and discussing it and Freundlich's research. Noting that the answer to the "interessante Frage" is not easily found because the light refraction by the Sun's atmosphere has to cooperate, and stating that one thing can be said with certainty: if no such deflection [of spectral lines] exists, then the prerequisites of this theory are not applicable. Further stating that these prerequisites, however self-evident they might be, are very audacious. Musing on the ability to conduct the research if we had a larger planet than Jupiter, but noting that nature did not make it easy for us to find out her principles. Mentioning that Einstein was told that similar surveys had been made in Hamburg, and asking for the results from Freundlich's research of and measuring of the planets.

ArchivalResource: 1 item (2 p.) ; 17.3 cm.

http://www.worldcat.org/oclc/502413115 View

Einstein, Albert, 1879-1955. Autograph letter signed : [Zurich], to Erwin Finlay Freundlich, before 1913 Aug. 26.

Title: Autograph letter signed : [Zurich], to Erwin Finlay Freundlich, before 1913 Aug. 26.

Referring to Freundlich's interest in gravitational light deflection and expressing particular interest in his plan to observe stars that are close to the sun during daytime. Sharing some thoughts on how this could work on the photographic plates and possible difficulties. Expressing great interest in the results of the research on double stars, because they could affect his theory of relativity. Looking forward to meeting Freundlich and his wife during their honeymoon (which they have planned to spend in Switzerland). Mentioning that he will be in Zurich until mid-September, except on September 7 and 8, when he will be in Frauenfeld to deliver a lecture. Thanking Freundlich for his congratulations (on Einstein's election to membership in the Prussian Academy of Sciences). With several penciled formulas and graphs on p. 4.

ArchivalResource: 1 item (4 p.) ; 17.8 cm.

http://www.worldcat.org/oclc/502420041 View

Einstein, Albert, 1879-1955. Autograph letter signed : Zurich, to Erwin Finlay Freundlich, [1912] Oct. 27.

Title: Autograph letter signed : Zurich, to Erwin Finlay Freundlich, [1912] Oct. 27.

Thanking Freundlich for his detailed report. Regretting that the photographs lack the precision necessary to make measurements. Noting that he recently asked the astronomer in Zurich whether the measuring could be done during bright daylight (as proposed by Freundlich), and that the astronomer does not believe it is possible, but assuring Freundlich that Einstein is not at all convinced that he is right. Doubting whether the photographs can be made in Babelsberg, due to the poor the clarity of the atmosphere. Mentioning that his own theoretical efforts are progressing well, after a period of difficultly, and that he fully expects to have finalized the equations of the general dynamics of gravitation in the near future. With a postscript hearkening back to Freundlich's research, wondering whether immediate observation (though less precise) might be preferable to using photographic plates.

ArchivalResource: 1 item (4 p.) ; 17.8 cm.

http://www.worldcat.org/oclc/502428046 View

Einstein, Albert, 1879-1955. Autograph postal card signed : Smichov, to Erwin Finlay Freundlich, 1911 Sept. 21.

Title: Autograph postal card signed : Smichov, to Erwin Finlay Freundlich, 1911 Sept. 21.

Giving a formula and discussing it. Noting that the system of units is irrelevant in the formula if it is measured in the same system. Wondering whether it possible to watch stars during bright daytime (without a solar eclipse) using available instruments, and mentioning that if this can be achieved, Freundlich could easily discern if the theory is correct. Stating that Einstein does not see the use of spectral segmentation here [in Smichov] and is curious to hear Freundlich's response.

ArchivalResource: 1 item (2 p.) ; 13.9 cm.

http://www.worldcat.org/oclc/502418825 View

Einstein, Albert, 1879-1955. Autograph letter signed : [Zurich], to Erwin Finlay Freundlich, [1913 Aug.].

Title: Autograph letter signed : [Zurich], to Erwin Finlay Freundlich, [1913 Aug.].

Thanking Freundlich for his letter and research efforts on the deflection of light, which is receiving broader interest, and assuming that Freundlich has received Einstein's new work. Mentioning that he considers Abraham's theory as inconsistent, and stating that the theory of gravitation by Mie is fantastic and the theory by Nordström is very rational. Noting that the next solar eclipse will show which of the two theories is the right one. With a postscript referring generally to a publication in an American journal that has been brought to his attention by the local astronomer.

ArchivalResource: 1 item (3 p.) ; 21.1 cm.

http://www.worldcat.org/oclc/502416191 View

Freundlich, Erwin, 1885-1964. Correspondence and papers.

Title: Correspondence and papers.

ArchivalResource: 5 boxes.

http://www.worldcat.org/oclc/122520820 View