MOTION TO GREAT DISTANCES. 



153 



I-'.dinburfjh. Slight disturbance of the bitilar pendulum from 15 h 55 m to 16 1 ' 5. 

 Shide. 15 h 59 m 58' commencement of disturbance lasting 40 minutes. Preliminary 

 tremors 8 minutes. 



These times are tabulated below, being given in minutes after 15 h . 



The increase in the displacement of the horizontal pendulum at Potsdam, 47 m , 

 does not seem attributable to any of the three phases under consideration. 



2nd Shock of 17 h 36 m . 



Nicolaiew. 18 1 ' 2'5 m commencement of disturbance, end at 18 h 57. 



Potsdam. 17 h 51'5 m commencement ; at 55 5 there is a sudden increase of anipli- 

 txide, and the trace becomes lost shortly afterwards. End at 19^''. 



Ischia. The horizontal pendula were disturbed at 17' 1 3G m 58', or practically 

 simultaneously with the origin of the shock. As in the case of the previous earth- 

 quake, and for the same reasons, this disturbance may be neglected. At 44 35" on 

 the N. S. pendulum there was a slight increase, and at 46 10 s on the of her a group 

 of eight oscillations of 3 '4 s period. At 50"' 40 s the disturbance of the N. S. 

 j>enduluin was more noticeable, afterwards diminishing, and at 51 on the other is a 

 group of undulations of 6" period. At 54'" on the one and 54'" 30" on the other the 

 oscillation was more noticeable and slow. At 1 8 h O m it was very slow, but irregular, 

 reaching its maximum at 18 1 ' 5 m , and ceasing at 18' 1 51. 



Catania. Commencement about 17 h 46 m 18" of very minute undulations; from 

 17 h 51'" 55 s to 52 in 37' a group of seven very regular undulations of 6* period end at 

 19 h ll ni 1". On the other (N.E. S.W.) component the time of commencement is the 

 NU lie ; the end is at 18' 1 48". 



Rocca di Papa. Grande sismoni. Commencement of slight oscillations at 17 h 48, 

 which have an easily distinguished maximum at 18 1 ' G 1 ", and end at 19' 1 17, The 



VOL. cxciv. 4. x 



