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XVII. Account of an Earthqua 7 e at Hafodunos near Denbigh. 
By John Lloyd, Efq. F, R. S. in a Letter to Sir Jofeph. 
PON the 29th day of lad: Auguh, at 8 h. 37' 30 7 , I 
was fitting on my * bed -fide, and heard a rumbling: 
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none, as if at a distance.: the found feemed to approach me, 
and when it was greateh the bed rocked and (hook fo much 
that I could fcarcely. keep my feat. . I could have no doubt of. 
its being an earthquake, and inhantly looked at my barometer, 
which is of Mr. be lug’s conhruction ; it hood at 29.^7 inches. 
Attached thermometer . 65°. . The barometer had been hationary 
nearly for the three preceding days, and did not feem to be 
affected with the fhock. The morning was remarkably fine, 
and not a fingle cloud to be feen. Two of my fibers and a 
gentleman were walking upon the terrace in the garden by the 
fide of a wall: they all perceived the noife, at firh as if at a 
great dihance ; but when it was greateh they perceived the 
wall toThake, though they did not obferve any agitation under 
then feet. .As tiiey were walking, and obferved the fpot when 
1 his heufe is built upon the fide of a rock.; and my bed-chamber, though 
up two pair of flairs, is on a ground-floor, the floor is not more than one foot 
from the folid rock in my bed-chamber. 
Read April 5, 1781. 
DEAR. SIR,, 
Hafodunos. near Denbigh, 
Dec. 31, 1781. 
they 
