ON SEISMOLOGICAL INVESTIGATION. 



147 



The sudden displacements or disturbances noted at Carisbrooke are 

 given on the list just mentioned. As compared with Shide they are very 

 few in number, and at the two stations there was no agreement in the 

 times at which they took place. 



Tremors and pulsations, which I am inclined to regard as being due to 

 slow and fairly regular air currents within the covering cases of instru- 

 ment, were practically absent at Carisbrooke. 



Because the observation of the diurnal wave and longer-period move- 

 ments require an adjustment of the clockwork, so that it runs at a; 

 Slow speed, these were not observed. Inasmuch as readings taken of the 

 position of the end of the boom showed but little change, it is probable 

 that they are small. 



Because the latter three classes of inovement were frequent at Shide, 

 whilst they were practically absent at Carisbrooke, it is evident that thei 

 latter station is the better site for the observation of earthquakes. 



Displacements observed at Carisbrooke Castle and Shide in, 1896. 

 1. d.= large displacement; m. d. = moderate displacement; s. d.= small displacement.' 



Date 



June 16 

 „ 21 



23 



25 

 26 

 27 



28 



L2 



