Page:Great Neapolitan Earthquake of 1857 Vol 2.djvu/401

336 pier or tower; and the third, where it is possible, but not necessary to conclude, that the determination is below the tenth, from some cause.

The mean velocity given, by the first group of eleven separate and independent determinations, is 12·366 feet per second. It is a little doubtful, (Part II. in loc.) whether the velocity at Tramutola, was not slightly increased, by some surface oscillation; reasons of sufficient weight however are assignable from conditions of formation alone for finding a high velocity at that place.

If we omit Tramutola, and deduce a mean velocity from the remaining ten terms, we obtain 12·039 feet per second;