[ 33 l ] 
XVII. Account of an Earthquake at Hafodunos near Denbigh. 
By John Lloyd, Efq. F, R, S. in a Letter to Sir jofeph 
Banks, Bart. P. R. S. 
Read April 5, 1781, 
BEAR SIR, 
Hafodunos near Denbigh, 
Dec. 31, 1781. 
U PON the . 29th day of laft Auguft, at 8 h. 37' 30 I 
was fitting on my * bed fide, and heard a rumbling 
ixoile, as if at a diflance 1 the found feemed to approach me, 
and when it was greateft the bed , rocked and fhook fo much 
that I could fcarcely keep my feat. . I could have no doubt of 
its being an earthquake, and inftantly looked at my barometer, 
which is of Mr. de; luc’s conftru&ion ; it flood at 29.57 inches. 
Attached thermometer 6 5 0 . . The. barometer had been flationary 
nearly for the three preceding days, and did not feem to be 
affefled with the fhock. The. morning was remarkably fine, 
and not a jingle cloud to be feen. Two of my fillers and a 
gentleman were walking, upon the terrace in the garden by the. 
fide of a wall: they, all perceived the noife, at firft as if at a 
great diflance ; but when it was greateft , they perceived the 
wall to fhaice, though they did not obferve any agitation under 
their feet. As they were walking, and obferved the fpot when 
This houfe is built upon the fide of a rock ; and my bed-chamber, though 
up two pair of Hairs, is on a ground-floor, the floor is not more- than one. foot 
from the folid rock in my bed-chamber., 
thev 
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