Michelson did not observe the expected 0. 04 fringe shift ; the greatest average deviation that he measured ( in the northwest direction ) was only 0. 018 fringes, while most of his measurements were much less.

Michelson did not observe the expected 0. 04 fringe shift ; the maximum possible shift was at most only about 0. 02 fringes.

0.038 seconds.