Group portrait at Pierre Weiss's Laboratory

Tea in Pierre Weiss's Laboratory in the Institute of Technology (Eidgenossische Technische Hochschule) Zurich. Front row L-R: Karl F. Herzfeld, Otto Stern, Albert Einstein, Auguste Piccard (Weiss' assistant, later a balloonist), René Fortrat (Weiss' assistant, author of Fortrat diagram - frequency of diatomic molecules as function of rot, qu. Number) ; Rebekka Aleida Biegel (astrophysicist and psychologist). Back row L-R: Catharina Amelia Frankamp, Paul Ehrenfest, Eva Dina Bruins, Gabriel Foëx, and Frithiof (Fred) Wolfers. Foëx and Wolfers were also Weiss' assistants. 

(Amendments to this description, particularly of the women present and the date, come from the research of Jacques Dane and Chris Verhoef, supplementing prior analysis by Joanna Behrman in the 2023 AIP Ex Libris Universum blog post "A History Mystery: Adventures Identifying People in a Photograph," and notes made in 1979 by Beat Glaus of the ETH in Zürich. Prior identifications suggested a Miss Grigorjeff [Maria Semenovna Scanavy-Grigorieff] was pictured.), Credit Line: AIP Emilio Segrè Visual Archives, gift of Karl F. Herzfeld
Abstract/Description: Tea in Pierre Weiss's Laboratory in the Institute of Technology (Eidgenossische Technische Hochschule) Zurich. Front row L-R: Karl F. Herzfeld, Otto Stern, Albert Einstein, Auguste Piccard (Weiss' assistant, later a balloonist), René Fortrat (Weiss' assistant, author of Fortrat diagram - frequency of diatomic molecules as function of rot, qu. Number) ; Rebekka Aleida Biegel (astrophysicist and psychologist). Back row L-R: Catharina Amelia Frankamp, Paul Ehrenfest, Eva Dina Bruins, Gabriel Foëx, and Frithiof (Fred) Wolfers. Foëx and Wolfers were also Weiss' assistants. (Amendments to this description, particularly of the women present and the date, come from the research of Jacques Dane and Chris Verhoef, supplementing prior analysis by Joanna Behrman in the 2023 AIP Ex Libris Universum blog post "A History Mystery: Adventures Identifying People in a Photograph," and notes made in 1979 by Beat Glaus of the ETH in Zürich. Prior identifications suggested a Miss Grigorjeff [Maria Semenovna Scanavy-Grigorieff] was pictured.)
Subject(s): Portraits
Laboratories
Portraits, Group
Herzfeld, Karl F. (Karl Ferdinand), 1892-
Stern, Otto, 1888-1969
Einstein, Albert, 1879-1955
Ehrenfest, Paul, 1880-1933
Date Created: 30 June 1913, around 4:30pm
Credit Line: AIP Emilio Segrè Visual Archives, gift of Karl F. Herzfeld
Catalog ID: Herzfeld Karl E1