128 REPORT— 1895, 



Tremors, Miceosbismic Disturbances, or Earth Pulsations — continued. 



(d) The Slow Displacement of Pendulums. 



All my horizontal pendulums, whether they were situated upon the 

 Tock or upon the alluvium, have crept away from their normal position. 

 While some of them have moved towards the east, others have moved 

 towards the west. Irregularities like these have been noticeable upon 

 newly built light foundations. Pendulums like those at A and L, where 

 the foundations were massive and old, during the time that they were 

 observed, had a general tendency to creep towards the west or south- 

 west. These movements, which were often interfered with by permanent 

 •displacements caused by earthquakes, closely resembled the gradual dis- 

 placements observed at stations upon the rock, where, for earthquakes at 

 least, the yielding parallel to the dip of the strata was greater than it was 

 in a direction at right angles to the same. 



Although my intention when installing the instruments parallel and 

 at right angles to the dip was to determine in which of these two direc- 

 tions yielding was the most pronounced, the observations were not con- 

 tinued sufficiently long to determine whether such changes as were 

 observed had any connection with the secular movements which around 

 Yokohama are apparently proceeding with unusual rapidity. To carry 

 out this investigation, which would not be difficult for a resident at 

 Karnakura, where caves are numerous, at least two installations would 

 be required, and it is not unlikely that within a period of two or three 

 years some measurement of geological changes would be obtained. I also 

 regret to say that the duration of the observations was not sufficiently 

 long to determine whether the wandering of the 25endulums had an 

 annual periodicity such as might be expected from the results obtained by 

 observers in Europe. 



