326
TRANSIT VELOCITY DEDUCED
We must reduce the former to the latter.
| h. | m. | s. | |
|---|---|---|---|
| Sun's right ascension when on the meridian at Naples, on the 16th December, 1857 | 17 | 36 | 4·45 |
| Time by Signor Fiodo's clock | 10 | 13 | 26·00 |
| 27 | 49 | 30·45 | |
| Sidereal time at mean noon on that date | 17 | 40 | 6·91 |
| 10 | 9 | 23·54 | |
| Acceleration = minus | 0 | 1 | 39·83 |
| Moment of shock at Naples, according to Signor Fiodo, in Naples mean solar time | 10 | 7 | 43·71 |
| Which we may call | 10 | 7 | 44 |
The difference, therefore, between the times noted by him, and at the observatory, is equal to 2m 16s. The high probability is, therefore, that Signor Fiodo's clock was stopped by the first tremulous movement, (having been specially prepared by him, that it should be readily stopped,) and that the clocks at the Observatory, were stopped by the second which occurred shortly after, with a little interval between, (see Guiscardi, Part II.) these clocks having been arranged to go and not to be stopped by a shock.
We may, however, take the transit time from both data—
| h. | m. | s. | |
|---|---|---|---|
| Time of shock at Naples (Fiodo's) | 10 | 7 | 44 |
| Time at the seismic vertical | 9 | 58 | 58 |
| Time of transit from the latter to Naples | 0 | 8 | 46 |
