Niels Bohr, "Das Quantenpostulat und die neurere Entwicklung der Atomistik", in Die Naturwissenschaften, volume 16, part 15, 13 April 1928, pp 245-255 in the issue of pp 245-268. This is the complete weekly issue, without the wrappers, removed from a larger bound volume. Very Good condition. $500
”From the epistemological point of view, the discovery of the new type of logical relationship that complementarity represents is a major advance that radically changes our whole view of the role and meaning of science. In contrast with the nineteenth-century ideal of a description of the phenomena from which every reference to their observation would be eliminated, we now have the much wider and truer prospect of an account of the phenomena in which due regard is paid to the conditions under which they can actually be observed—thereby securing the full objectivity of the description, since the description is based on purey physical operations intelligible and verifiable by all observers. The role of the classical concepts in this description is obviously essential, since those concepts are the only ones adapted to our capabilities of observation and unambiguous communication.
“In order to establish a link between these concepts and the behavior of atomic systems, we have to use measuring instruments composed—like ourselves—of large numbers of atoms, and this requirement unavoidably leads to complementary relations and a statistical type of causality.”-- Complete Dictionary of Scientific Biography, vol. 2, 2008, pp. 239-254.
“The role of complementarily in quantum mechanics is above all to provide a logical frame sufficiently wide to ensure the consistent application of classical concepts whose unrestricted use would lead to contradictions. Obviously, such a function is of universal scope, and an occasion soon presented itself to put its usefulness to the test. In the early ’s the extension of the mathematical methods of quantum mechanics to electrodynamics was beset with considerable formal difficulties, which raised doubts regarding the possibility of upholding the concept of the electromagnetic field in quantum theory.”--Stanford Encyclopedia of Philosophy
“From the two main physical theories of this century, relativity theory and quantum theory, two general viewpoints have emerged, that of relativity and that of complementarity.”--O. Klein, in W. Pauli Niels Bohr & Devel. Physics 96
“In the description of atomic phenomena, the quantum postulate presents us with the task of developing a ‘complementarity’ theory the consistency of which can be judged only by weighing the possibilities of definition and observation.” AND “We meet here with a complementarity of the possibilities of definition quite analogous to that which we have considered..in connexion with the properties of light and free material particles.”--N. Bohr in Nature 14 Apr. 1928 (Suppl.) 580/2 and 587/1
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