398 Mr. Mallet's Notice of the British Earthquake of November 9, 1852. 



The police authorities promptly answered the author's desire, and the testi- 

 mony of the police on duty having been taken by one of the inspectors, they 

 forwarded to him documents of which the following embraces the sum. 



1 . A great number of the police observed a shock. 



2. Several of the men state that the motion was sideways, others that it 

 was up and down. They are also divided in opinion as to whether it was from 

 east to west, or from north to south. 



3. AU agree in stating that the time was two or three minutes before or 

 after 4 o'clock, a.m. 



4. All heard a rumbling noise, somewhat like distant thunder ; they also 

 heard a rattling of windows as if shaken by a concussion. 



The result proves how little reliance as to accuracy or amount of informa- 

 tion is to be expected from persons untrained in habits of exact and faithful 

 observation. 



Through the zealous co-operation of Mr. Clibborn, a veiy large number 

 of private letters and other communications Avere received, and many others, 

 as well as newspaper notices, were transmitted directly to the author. The 

 great mass of these, however, were liable to the remarks just before made. 

 A very few, selected for their graphic character, were sufficient to read to 

 the Academy, though not to publish in extenso. All that appeared worthy of 

 credit for accuracy, &c., were arranged and discussed in the form following, 

 very much upon the model of the Great Earthquake Catalogue of the Trans- 

 actions of the British Association ; and from the combination of information 

 from all sources the Seismic map accompanying this paper was prepared. Upon 

 it all places at which a record exists of the shock having been felt are marked 

 in red letters. Wherever the time of the occurrence of the shock was noted 

 it is marked after the name of the place of observation. The time in Ireland 

 is assumed as that for the meridian of Dublin ; that in Great Britain is, with one 

 exception (Congleton), Greenwich mean time. Wherever the horizontal direc- 

 tion was noted, it is marked by a red arrow passing through the place in that 

 direction. The broad shaded line generally circumscribes the space within 

 which the shock is recorded to have been actually felt, or may be inferred that 

 it might have been felt. But it will be understood that such a boundary is 

 wholly imaginary, and serves merely to convey a general notion of the form of 

 the territory shaken, as the motion due to the earth-wave (like all other 

 elastic waves in media of indefinite dimensions) passes away from the point of 



