*"-**. 



'28 071 the Cyclones of the North Pacific Ocean, 



very near to tlie ship; as is showOj also, bj the great fall of the 

 "barometer and the intensity of the gale at that period. 



At Macao, the typhoon was experienced in great force, eighteen 

 or twenty hours later than with the Raleigh. A valual»le series 

 of observations was here taken of the barometer, in the typhoon; 

 the lowest being 28"08 inches, at 1.20 A. M. of 6th of August. 

 This great depression shows the center or vortex to have passed 

 near Slacao. 



At Canton, about sixty miles north of Macao, the gale began 

 on the evening of the otli, with northerly winds, and continued 

 througb the following day. At raidnio^ht following the 5th the 

 barometer had fallen to 29*37; but its further fall in the night 

 was not observed. At 5 A. m. it had risen to 29'34; and at 8 

 A. M. of 7th, it had risen to 29*94 inches. The wind, during the 

 typhoon, veered from N. through N.E. and E. to S.E- 



The ship Lady Hayes sailed from Macao before the gale, and 

 first encountered it about thirty-five miles from land. She ran 

 off southeastward with a north wind and tremendous swell from 

 eastward, and at 8 P. M. of 5th the wind began to veer westward, 

 blowing as hard as ever till midnight, and drawing round to the 



south. It continued blowing hard from this quarter until noon of 

 the 6th. It is seen by the veering of the wind that this ship was 

 on the left or southerly side of the path of the gale's axis. A 

 British schooner also encountered tlie gale on the 6th of August, 

 in lat. 18° Oi' N"., Ion. 115^ 50' E. ^ The ship American Levant 

 in coming up the. China Sea, ran into the rear of this cyclone, 

 and thus made a fine run into port at Linteri. 



From these data, the course of tlie storm appears to have been 

 N, 72 W. ; and its rate of progression about seventeen miles an 

 hour: the line on which its axial center appeared to advance is 

 marked A^ B, C, on the sketch. If circles having a radius of 

 one hundred and sixty nautical miles be drawn around the two 

 points B and Cj these will comprise, severally, the areas of 

 chief violence in this hurricane at the successive periods, 9 A. M. 

 of 5th and 2 A. M, of 6th of August. But the cyclone must 

 have extended, of less force, very far beyond these approximately 

 estitnated limits. 



More detailed accounts of the phenomena of this typhoon 

 may be found in vols, xxxv and xxxvi of this Journal for 1839 ; 

 where will also be found notices of the typhoon of the Panama, 

 before referred to, and of another which visited Canton on the 

 8d of Augiist 1832 ; another on the 23d of September 1831 ; 

 both of which had crossed the China Sea; also, of four succes- 

 sive typhoons which were encountered in the China Sea by the 

 convoy under H. M. S. Swift, in the China Sea, on June'i9th, 

 July 2d, July 8th, and July 17th, 1797; in the second of which, 



the Swift is supposed to have foundered. The tracks of these 



