76 Mr D. Milne on Earthquake -Shocks felt in Great Britain^ 



2iVst January 1841. — This date is noticed, merely because, 

 on the morning of that day, and almost at the same hour, a 

 shock was felt at Comrie and in Wales. At Comrie it occur- 

 red about 2 A. M. At Carmarthen, if the account in the news- 

 papers is to be trusted, it occurred " between 3 and 4 o'clock 

 A. M. It was a smart shock, accompanied by a very visible 

 tremor of the earth, and a rumbling noise similar to the sound 

 of distant thunder.'' Several other towns in Wales are men- 

 tioned, where a shock was felt at the same instant. It is 

 added, that " similar shocks were observed about the month 

 of last November in the neighbourhood of Llanstephan.'' 



X^thMarch 1841. — At Comrie, the two inverted pendulums, 

 though of different lengths (the one 30 inches, and the other 

 128 inches), had their points thrown to the west half an inch. 



22^ March 1841. — At Comrie, these instruments were again 

 affected, as on the 10th, though not quite to the same extent. 



\^th and 2\st April 1841. — On these days, shocks occur- 

 red at and near Oban, in Argyleshire, which do not appear to 

 have been felt at Comrie. 



On the first of these days, they occurred at 5^ 30' A. m., 

 11^^ A. M., and 2^ 30' p. m. 



On the last mentioned day, " the shock occurred at 1^ 35' 

 A. m., and was felt severely at the Lismore Lighthouse. The 

 watcher there was greatly alarmed, by a loud noise resembling 

 that of a cannon discharged at a short distance. The noise 

 was accompanied with a shaking of the lighthouse tower, — 

 the top of which is 103 feet above the sea. The tremor was 

 such as to cause the reflector frame and glasses to tingle. 

 The people at the bottom of the lighthouse heard the noise, 

 but were not sensible of the tremulous motion. The Ferry- 

 house at Connal (which is about nine miles east of the light- 

 house) was rent by the shock. No effect was produced on the 

 barometer. At the time of the shock, there was a smart 

 breeze blowing from the north." 



4M July 1841. — The shock under this date does not appear 

 in the Comrie Register. The only place from which any ac- 

 count was received describing its occurrence is Kinlochmoi- 

 DART, in Argyleshire, situated immediately to the north of the 

 point of Ardnamurchan. Mr Robertson says of this shock, 



