Earthquakes. — Improved Copper Sheathing, Sfc. 233 



partly at rest and partly in motion. Having at length reached 

 the brink of the precipice, it rushed over the steep with a tre- 

 mendous noise, and the discharge was heard distinctly at a 

 distance of four miles. How long the flow continued our 

 friend cannot say, but he heard it for an hour at least after he 

 had quitted the ground, frequently making a noise like the 

 plunge of large bodies precipitated from a considerable eleva- 

 tion into the deep. From the examination which he gave to 

 the summit of the bog, he conceives that a body of peat moss 

 is loosened by these disruptions to the extent of a mile in cir- 

 cumference, and the prevailing opinion on the spot, in which 

 he concurs, is, that this enormous mass will come away before 

 the discharges from Crow-hill finally cease. — The water in the 

 river Aire, at Leeds, yesterday evening was as turbid as it 

 has been at any period since these discharges commenced. — 

 Leeds Mercury. 



EARTHQUAKES. 



A smart shock was felt at New Brunswick on the 9th of 

 July, accompanied by a loud report similar to the discharge 

 of heavy ordnance. 



On the morning of Sunday the 8th of August, a smart 

 shock of an earthquake was felt at Comrie, Perthshire, and its 

 neighbourhood. Some houses were perceived to shake, and fire- 

 irons &c. were overturned, but no serious mischief was done. 

 The noise heard has been compared to that caused by a heavy 

 waggon rolled rapidly over a paved causeway. 



On the 18th of August, a shock was felt at Harderwyck, in 

 Guelderland. It proceeded in a south-west direction, and 

 the noise accompanying it resembled that of several loaded 

 waggons in rapid motion. In some houses the doors suddenly 

 flew open, and in others the inmates thought the roofs were 

 coming down. Twenty soldiers, who were sleeping on the 

 grass in a plantation near the place, were roused from their 

 slumbers, and much alarmed by the noise and the tremor of 



the earth. 



snt n. daw's rMPitovEO copper sheathing, and dr, tiarks's 



TRIGONOMETRICAL SURVEYS. 



We laid before our readers in our number for July, Sir 

 I Iumphry Davy's paper on the means lor preventing the cor- 

 rosion of tin' copper sheathing of ships. Since that paper was 

 read before the learned Society of which he is president, his 

 discovery has been put to the test of experience. 



Sir I Iumphry has just returned from a voyage to Norway. 

 During the months of July and August he was engaged in pur- 

 suing various philosophical researches, for which the Admiralty 



uitod him the ii e at the Comet steam-boat. He has ascer- 



Vbl. 64. No. 9 1 7. Sept. 1 82 l . < > g toined 



