 Among physicists Bridgman’s reflections found a strong echo, especially in the early days. Perhaps that was natural: it has been said, by Bridgman himself too, that operationalism arose from observing “physicists in action” (Bridgman in Frank 1956, 80). Gerald Holton (1995a, 224) recalls what an “electrifying experience” it was for himself and many other physicists to read The Logic of Modern Physics for the first time, but explains that the “immense power” of Bridgman’s work is “not that the work brings to the reader a message never thought of before, but that it lays open, with clarity, what the reader has been trying to formulate on his or her own”. In Mary Hesse’s view Bridgman only gave “the most explicit formulation” of a common view, which was shared even by Arthur Eddington, whose metaphysical musings about physics Bridgman took a strong exception to: “A physical quantity is defined by the series of operations and calculations of which it is the result” (quoted in Hesse 1952, 218).