On Earth Vibrations

Details On Earth Vibrations On Earth Vibrations

Mar 1892

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1892natur..45..510o&link_type=abstract

Nature, Volume 45, Issue 1170, pp. 510-511 (1892).

Mathematics

Logic

Scientific paper

IT seems that the earth, once set in vibration, maintains this state for a long time before coming to rest. The observers of Greenwich (see Major H. S. Palmer in the Transactions of the Seismological Society of Japan, vol. iii., p. 148) found that from time to time, at considerable intervals, there was an evening when the usual observations for determining the collimation-error of the transit-circle by means of reflection in a tray of mercury could not be taken, on account of the constant trembling of the surface of the mercury, which on such occasions continued until long past midnight. These are occasions when crowds of the poorer classes of London flock for amusement to Greenwich Park. A favourite pastime with the young people, often prolonged until after nightfall, is to clamber to the top of the steep slopes of the hill on which the Observatory stands-in fact, to the paling of the enclosure-and then, joining hands in twos or threes, to bolt precipitately to the bottom, where, as may be imagined, they usually arrive ``all in a heap.'' Hundreds join in this sport on fine evenings, and the result, as shown by the behaviour of the mercury, is to set the whole of Flamsteed Hill in a tremor, which does not subside until early next morning, many hours after the people have left.

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