374 Dr. Gray's Account of the Earthquake 
past eleven, and the earthquake came on about a minute after 
the blast. Now, if we suppose it to have been only twenty- 
one minutes past eleven when the blast was heard, it will bring 
the time of the earthquake to twenty -two minutes past eleven ; 
and, if we allow a minute and a half for the difference of lon- 
gitude between Kenilworth and Wollaton, there will still re- 
main an interval of fourteen minutes and a half for its progress 
from the first mentioned place to the latter. The distance be- 
tween these two places is about forty -five miles, and the situa- 
tion of Wollaton, with respect to Kenilworth, is about north 
north-east : consequently, the observations of Mr. Johnson 
and Mr. Gregory are, of themselves, sufficient to render it 
probable (as far as observations of time made in two places 
only can do so) that the direction of the earthquake was not 
very different from that above stated ; at least, that it was 
from some point to the westward of south, towards some 
point to the eastward of north*; which, as was before ob- 
served, is very contrary to the idea which most persons who 
felt it formed of its progress. 
These two observations also, in my opinion, furnish ano- 
ther argument that the earthquake moved progressively in 
one direction only ; for, if it had been produced by a central 
force acting in all directions, we should surely have expected 
that the effects of that force would have been most powerful 
where they were first felt ; whereas, we have seen that the 
earthquake, though undoubtedly more severe in Nottingham- 
shire than in Warwickshire, was felt much sooner in the last 
mentioned county. 
Of the various earthquakes felt in England within this cen- 
tury, those to which the one here treated of has most analogy 
