146 MR. R. I). OLDHAM ON THE PROPAGATION OF 



geographical position of the epicentre is concerned, and the time error is probably 

 under 0'25 ra . The time may, therefore, be taken as 8 1 ' 7'". The abstract of the 

 records in Europe is taken from the ' Boll. Soc. Sismol. Ital.,' vol. 2, Part II., except in 

 the case of the records from the Isle of Wight, which are abstracted from ' Brit. Assoc. 

 Report,' 1896, p. 229. 



Nicolaiew. 8 h 7'5 m commencement, 8 h 17 m sudden increase ; 8 h 30 m , width of trace 

 10 millim., 8 h 33 m disappearance of ditto, end at ll h 7'". 



Strassburg. Commencement 8 h 17 m 50 s , maximum 8 h 29 m 56 B , end II 1 ' 38 m 2' 

 (' Nature,' vol. 55, p. 558). 



Isle of Wight. Commencement at Carisbrooke Castle 8 h 23'" 6 s , exceedingly minute 

 tremors ; first decided tremors 8 h 31 m 46 s at Carisbrooke, 8 h 31 m 42' at Shide ; heavy 

 motion commences 8 h 57 m 6 s and 56 m 49 s respectively, maximum, first at 9 h 4 m 26", 

 and absolute at 14 m 26 s , both at Carisbrooke; end of disturbance II 1 ' 16 20 9 , and 

 10 h 59 36'. 



Rocca di Papa.- Horizontal pendula ; commencement 8 1 ' 31 ; these undulations 

 had a period of 30 s and at 9 h the character of the record changed to undulations of 

 14 s , attaining their maximum at 9 h 4 m ; end of disturbance about 10 h . 



Seismograph of 7 m . Commencement 8 h 55 m , maximum 9 h 4" 1 , end 9 1 ' 6'5 m . 



Seismograph of 15 m . E. W. component : commencement 8 1 ' 21, disturbance 

 becomes very distinct at 8 1 ' 32"' 30 s ; 8 h 41 m commencement of waves of 30 s period, 

 which change to 14 s period at 8 h 59 30 s , maximum of these 9 1 ' 4 m , end at 10 h 16 m ; 

 N. S. component: first visible tremors 8 1 ' 21 m , which became distinct at 8 h 31'5 m ; 

 8 h 40" 1 commencement of waves of 30 s period, which change to 14 s period at 8 1 ' 58'" 30 s , 

 maximum 9 h 4 m , end 10 h O" 1 . 



Rome. Sismom. grande, 16 m , 200 kilogs., N.E. S.W. component: 8 h 21 m 15 s com- 

 mencement, after a diminution a group of oscillations recommences at 8 h 31 m 10 s , at 

 8 h 58 m 20 s the slow undulations commence, maximum, 9' 1 4 m 15 s , end 9 h 24 m 35'; 

 N.W. S.E. component : commencement not distinctly determinable, but becomes 

 distinct at 8 h 24 m . Somewhat considerable oscillations commence at 8 1 ' 29 55 s , with 

 a maximum at 8 1 ' 32'" 20 s ; the slow undulations commence at 8 h 58 40 s , maximum 

 9 h 3 55', end 9 h 25 m 50 s . 



Ischia. Horizontal pendula ; commencement of first phase 8 h 20 m 30 s , of second 

 phase 8 b 31 30', of third phase of long undulations 8 h 49'" 41 s , maximum 9 h 6 m , end 

 10 h 21 m . 



Catania. Commencement 8 h 25'" 24 s ; at 9 1 ' 32 m 24 s commencement of another 

 group of oscillations of greater amplitude ; maximum of slow undulations about 9 1 ' 4 ; 

 N.W. S.E. component gives a much better record, commencement 8 h 21 m 48 s ; at 

 8 h 32 m 33 s a decided increase in the disturbance, which had dwindled ; commencement 

 of slow oscillation 8 h 44 m 51 s , maximum about 9 h 3 m . 



Summarising the above abstracts we obtain the following times, in minutes after 



8 h A.M. 



