Stefan Meyer, c 1910. Source: Central Library for Physics, Vienna.

Ernst Lecher's physics courses in 1913. Source: Central Library for Physics, Vienna.

The library of the Physics Institute on Boltzmanngasse in Vienna. Karl Przibram is shown sitting and Josef Nabl is standing on the ladder. Source: Central Library for Physics, Vienna.

The Curies’ laboratory just before Pierre's speech at the big amphitheater at the Sorbonne in 1904. Source: Musée Curie

Georg Stetter at the Radium Institute, c 1933. Stetter studied physics at the University of Vienna after the First World War. In 1922 after completing his doctoral work, he became assistant at the Second Physics Institute. Source: Central Library for Physics, Vienna.

The laboratory of the physician M. Danysz at the Pasteur Institute. Source: Le Radium, May 1904.

The old Physics Institute in Erdbergstrasse, in Vienna's third district close to the Theresianum, a secondary school for the education of higher officials. Source: Central Library for Physics, Vienna.

Stefanie Horovitz at the Physics Institute. Source: Central Library for Physics, Vienna.

In Meyer's sketch, one can recognize the bridge that connects the Radium to the Physics Institute. Source: Archiv der Österreichische Akademie der Wissenschaften, Vienna.

Chart 4: Percentage of men's and women's publications at the institute's Mitteilungen from 1919/20 to 1933/34 Source: Mitteilungen of the Radium Institute.

Chart 1: Increase in the enrollment of female and male students at the University of Vienna, 1897–1914

The use of water bathing in fractional crystallization. As radium chloride is less soluble in water than barium chloride, if a mixture of these two is dissolved in water, the first crystals that are deposited are richer in radium than those that remain within the solution. Source: Le Radium, February 1904.

Georg Stetter in 1958, after retaining his former status as a head of the physics institute and an important Austrian physicist. Source: Central Library for Physics, Vienna.

Marietta Blau at the Radium Institute, c 1925. Source: Agnes Rodhe, personal archive.

The scintillation counter used by Dagmar Pettersson in 1922. (P) is the source, (F) is the absorbing foil and (Z) is the scintillation screen where a microscope was directly attached. Source: Dagmar Pettersson, “Über die maximale Reichweite der von Radium C ausgeschleuderten Partikeln,” Sitzungsberichte Akademie der Wissenschaften in Wien, Mathematisch-naturwissenschaftliche Klasse, Abteillung IIa, (1924) 133: 149–162.

The scintillation counter used by Elisabeth Kara-Michailova in 1927. Source: Elisabeth Kara-Michailova, “Helligkeit und Zällbarkeit der Scintillationen von magnetische abgelenkten H-Strahlen verschiedener Geschwindigkeit” Sitzungsberichte Akademie der Wissenschaften in Wien, Mathematisch-naturwissenschaftliche Klasse, Abteillung IIa, (1927), 136: 357–368.

Renovating the old physics institute in Türkenstrasse, c 1908. Source: Central Library for Physics, Vienna.

The hallways and staircases of the Physics Institute. Source: Central Library for Physics, Vienna.

“Dr. Marietta Blau at work . . . microscope tracks down path of an atom,” wrote the newspaper Miami Herald on October 5, 1958. As the writer Bert Collier explained, Blau and her colleagues were studying a series of emulsion plates, exposed to the Bevatron, using powerful microscopes. Source: Miami Herald, October 5, 1958.

Elizabeth Kara-Michailova at her desk in the Radium Institute, c 1925. Source: Agnes Rodhe, personal archive.