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In 1887, the magnetographs registered the Riviera earthquake at these and several other observatories, the distribution of which is shown in Fig.

The first was, that as we advanced to the west we were leaving the South Magnetic Pole, and I was anxious to have our magnetographs running as near the latter as possible.

In all the magnetographs, the record is made on photographic paper, which travels so slowly that the time of a movement can only be ascertained to the nearest minute.

Far beyond the limits of the disturbed area, however, the long slow waves sped over the surface, disturbing magnetographs and other delicate instruments.

M. Offret does not include Nice in his list of observatories at which magnetographs were disturbed.