C. Dcwison — British Earthquakes of 1889. 369 



St. Clether : like a distant peal of thunder or the passing of a very 

 heavy loaded waggon ; no tremors perceived. 



Temple : like the rumbling of thunder for a few moments, fol- 

 lowed by a tremulous motion. 



Treuegloss : a loud rumbling noise like thunder ; no tremulous 

 motion percei^ >d. 



With the exception of Laneast, from which I have no detailed 

 account, these five places are nearer to the spot indicated as the 

 epicentrum than any of the others from which records have been 

 received. From this point, Altarnon is distant 2f miles, North Hill 

 5, St. Clether 4, Temple 4, and Trenegloss 6^ miles. 



The second group includes places in the neighbourhood of the 

 boundary of the disturbed area : 



Bodmin : as if some person were walking with a heavy tread 

 three or four steps overhead. 



Boscastle : two distinct shocks are said to have been felt. 



Liskeard : (1) as if a heavy substance were thrown violently on 

 the floor of the adjoining room and also against the partition dividing 

 the two rooms, tremulous movements before the shock ; (2) one 

 sudden crash like an explosion, no tremulous motion perceived. 



North Petherwin : a slight vibration like that produced in a house 

 by the passage of a heavy waggon. 



St. Breward : like that produced by a cart passing along the road 

 at the back of the bouse. 



Warleggan : as if something very heavy had fallen in the house 

 with great violence, followed by a tremulous motion. 



From these accounts, we may conclude that, in the neighbourhood 

 of the epicentrum, the sound-vibrations were most noticeable, but 

 that these died out more rapidly towards the boundary of the 

 disturbed area than the vibrations of longer period, and near the 

 boundary the shock was felt as one or several thuds, or vibrations 

 of much larger amplitude than those which preceded and followed 

 them. 



Duration. — The duration of the shock is variously estimated at 

 from two to about twenty seconds. Thus, at Liskeard, according 

 to one account, it is said to have been more than two seconds, 

 according to another about fifteen seconds ; a tremulous movement 

 before the principal vibration being included in the latter estimate. 

 Other observations give about 2 seconds at North Petherwin, about 

 3 at St. Clether, 3 or 4 at Temple, 4 or 5 at Warleggan, 10 to 20 at 

 Trenegloss, and 12 to 20 at St. Breward. 



Intensity. — Throughout the disturbed area, the intensity seems 

 to have been remarkably uniform, indicating probably a great depth 

 of the seismic focus. According to the Eossi-Forel scale, the 

 intensity was IV. at the following places : Bodmin, Camelford, 

 Liskeard, Newport (near Launceston), St. Breward, Temple, 

 Trenegloss, Tresmere, and Trevalga. It may have been slightly 

 greater than IV., though probably not as great as V., at Altarnon, 

 St. Clether, and Warleggan : and perhaps slightly less than IV. 

 at North Hill. 



DECADE III. VOL. YIII. — NO. YIII. 24 



