Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Bohr Niels H2

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Bohr Niels H2

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Image title: 
Bohr's Last Blackboard
Credit line: 
AIP Emilio Segrè Visual Archives

'These rough drawings were made by Niels Bohr on the blackboard of this working room at Carlsberg [Copenhagen, Denmark] in the course of conversation on the eve of this death. The upper one represents a contour in a complex plane, surrounding a singularity (at the origin) of the nonuniform function VZ. It illustrates the early considerations on the ambiguity of language mentioned in the text. The lower drawing is a sketch of the 'Einstein box,' also described in the text. Fate has thus given us, by Bohr's own hand, a last symbolic record, as it were, of the beginnings and culmination of his thoughts on complementarity.' L. Rosenfield, 'Niels Bohr's Contribution to Epistemology,' Physics Today, October 1963, pages 47-54.

Photo date: 
Original format: 
3 photographic prints (black and white; 6.5 x 9.5 inches, 6.5 x 11 inches, 4.5 x 6 inches)
Bohr, Niels, 1885-1962