Page:Great Neapolitan Earthquake of 1857 Vol 2.djvu/395

which gives a transit rate of 6^s·14 per geographical mile, and a transit velocity $=989.4$ feet per second. This is the highest velocity obtained, which is what should be expected, inasmuch as more than one-half of the entire distance, is through comparatively level bedded, and little shattered rocks, of elasticity, quite as high as the limestone.

Atella is 21 geographical miles from the seismic vertical—

	h.	m.	s.
The moment of occurrence of the shock as given by the old cathedral clock in Naples mean time	10	1	54
The time of its occurrence at the seismic vertical	9	58	58
Difference = the total time of transit over 21 geographical miles	0	2	56

which gives 8^s·4 nearly for the transit rate per geographical mile, and a transit velocity $=723.2$ feet per second.

Barielle is 24·5 geographical miles from the seismic vertical—

	h.	m.	s.
The moment of occurrence of the shock there, was in Naples mean time	10	2	15
The time of its occurrence at the seismic vertical	9	58	58
Difference = the total time of transit over 24·5 geographical miles	0	3	17

which gives 8·04^s for the transit rate per geographical