"On the Problem of the Molecular Theory of Superconductivity" in Physical Review. **GROUNDBREAKING IN FRAMING SUPERCONDUCTIVITY AS A MACROSCOPIC QUANTUM PHENOMENON.**

London, F. [Fritz] "On the Problem of the Molecular Theory of Superconductivity" in Physical Review 74, 5, 1948, pp. 562-574. American Institute of Physics, Lancaster, 1948. This is the full issue, pp 511-629, extracted from a larger bound copy. GOOD condition (5/10). 714.3 "Fritz London's 1948 paper predicting that a spinning superconductor would develop a magnetic moment. It proposed that superconductivity is a condensed state in momentum space, resulting in long-range order of the momentum vector in ordinary space. It suggested the phenomenological London equations reflect a macroscopic quantum state. London predicted that a spinning superconductor would generate a magnetic dipole (the London Moment), with a field proportional to the angular velocity, marking a key, testable consequence of the theory. While reinforcing the London equations, the paper aimed to bridge the gap toward a future molecular/microscopic theory by focusing on the coherence of a quantum state."--Wikipedia "The work [offered here] was groundbreaking in framing superconductivity as a macroscopic quantum phenomenon (a concept that would later be foundational for the 1957 BCS theory) and provided a crucial link between experimental electrodynamics and future microscopic theory."--D. G. McDonald, "Superconductivity and the Quantization of Energy" in Science, 12 January 1990. 714.3.…