FOOTNOTES:
[47] The above times and all others in this chapter are given in Rome mean time, which is 50m. earlier than Greenwich mean time.
[48] Professor Uzielli has also published a map of the isoseismal lines for the Italian part of the disturbed area.
[49] It seems doubtful whether this movement was connected with the earthquake. M. Offret does not include Nice in his list of observatories at which magnetographs were disturbed.
[50] This is the time given by M. Offret. According to M. Mascart, it should be 6h. 25m. 40s.
[51] In order to test the truth of this explanation, M. Moureaux suspended a bar of copper at the Parc Saint-Maur observatory by two threads in the same way as the horizontal force-magnet. The direction of this bar was also registered photographically, and it remained unmoved during the Verny earthquake of July 12th, 1889, and the Dardanelles earthquake of October 25th, 1889, while one or more of the magnets were disturbed. The experiment, however, was ineffective; for, in order that the magnet may rest in a horizontal position, its centre of gravity must be at unequal distances from the two points of support.
[52] The hour-marks in Fig. 38 refer to Paris mean time, and those in Fig. 39 to Genoa mean time.
[53] In the seventeenth century, the maximum seismic activity was manifested in the neighbourhood of Nice, and in the eighteenth century in Piedmont.