ABSTRACT
The incessant references to clock readings may well seem artificial and somewhat wearisome, but they do serve to emphasize an absolutely essential feature—that the readers are dealing with a very explicit problem of measurement. But the space-time coordinates of the event are different as measured in different inertial frames. This is, of course, as true in the Galilean-Newtonian scheme as in special relativity. But the Einstein-Lorentz transformations have superseded the Galilean ones, and reduce to them. The essence of the phenomenon is that a lapse of time as recorded on a single clock is compared to the results of measurements in a reference frame relative to which this clock is moving. In any such comparison, it emerges that the elapsed time as measured on the single clock is less than the difference between the two clock readings that describe the beginning and end of this interval in the other frame.
