 Even in such convergent situations, we have to be wary of the danger of slipping into conceptual confusion through the use of the same word to refer to the subjects of different operations. If we do not temper our thoughts with the operationalist conscience always referring us back to concrete measurement operations, we may get into the sloppy habit of using one word for all sorts of different situations (without even checking for the required convergence in the overlapping domains). Bridgman warned: “our verbal machinery has no built-in cutoff” (1959a, 75). Similarly we could be misled by the representation of a concept as a number into thinking that there is naturally an infinitely extendable scale for that concept, since the real-number line continues on to infinity. It would also be easy to think that physical quantities must meaningfully exist down to infinite precision, just because the numerical scale we have pinned on them is infinitely divisible. Bridgman issued a stark reminder: