The invariance with motion of the measurement of two-way light signals in the Michelson-Morley experiment is extrapolated to one-way measurements. The time of arrival of signals at a distant point is accepted as indeterminate, in accordance with the before-and-after characterization of Robb; but it is shown that, in spite of this indeterminancy, definite expressions can be obtained for the operations involved in measuring one-way signals. Extension of the same reasoning leads to Lorentz-type transformations expressed in terms of observable rod and clock readings, which include the self-observed velocities of moved clocks used to set the epochs of distant clocks.
HERBERT E. IVES, "Extrapolation from the Michelson-Morley Experiment," J. Opt. Soc. Am. 40, 185-191 (1950)