| h. | m. | s. | |
| Moment of the shock at Naples as stated from the Osservatorio Reale | 10 | 10 | 0 |
| Moment of shock at the seismic vertical | 9 | 58 | 58 |
| Difference | 0 | 11 | 2 |
which, on the 68 miles' total distance between them, gives 9s·735 transit rate per geographical mile = 624·03 feet per second; and applying the same correction as before, for refractive retardation, the transit rate becomes 9s·457 per geographical mile, and the velocity feet per second; and assuming the difference of transit rate, between the limestone and tufa, to be as last obtained; then the transit rate from this observation, in the limestone, would be feet per second, or 64 feet per second below that of the preceding determination. I am therefore disposed to believe, that the Observatory clocks were stopped, by a movement shortly subsequent to that, which arrested Signor Fiodo's; and as we cannot know what the interval was, I reject the Observatory observation, as probably the least correct, and adhere to Fiodo's, as the best time measure we have, at Naples, and, per se, essentially a good one.
Monte Peloso is 36 geographical miles from the seismic vertical. At D'Errico's station,
| h. | m. | s. | |
| The moment of shock was in Naples mean time | 10 | 2 | 39 |
| The time of its occurrence at the seismic vertical | 9 | 58 | 58 |
| Difference = total time of transit over 36 geographical miles | 0 | 3 | 41 |
