MARIXE BAROMETER. 115 



lower if on the north side of east. The Avinds from south observations 



and SSW, which blow along the shore, kept the mercury up and inferences 



to about 30,10, when they were attended wilh fine weather, the^coiTeTpon- 



as they generally were ; but if the weather was squally, dent changes 



with rain, is stood about 29,95. During settled winds from of wind and 



' wcathei' to be 



between WNW and SW, with fine weather, the mercury expected after 



generally stood very low, down at 29,60 *; and what is change in the 

 more extraordinary, when these winds were less settled, and ^g^^"^ ^''"' 

 the weather dull, with rain occasionally falling, the range of 

 the mercury was usually between 29,80 and 30,10; nearly 

 the same as when th3 wind was at SSW with similar 

 weather ; the reason of which may probably be*, that at 

 some distance to the southward these wcstwardly winds 

 blew more from the south, and were turned out of their 

 course, either by the mountains, or by meeting with a north- 

 west wind farther to the northward. 



The winds from north and NW blew very seldom at 

 this time : the mercury fell on their approach. 



To the state of the mercury during our second stay at 

 Port Jackson, in July, 1803, and part of June and August, 

 it is not in my power to refer, as Ihave not been able to 

 obtain that part of my jonrnal from General Dc Caen. 



The eifects of some winds upon the barometer in this 2d 

 example, are considerably different to what they were upon 

 the south coast. The wind at WSW or SW with fine 

 weather, had always caiised the mercury to rise and stand 

 high, and those from the NE to fall ; whereas here, the 

 eOects of those winds were almost directly the reverse. The 

 winds from SSW, SE, and as far as east, made it rise on 

 both coasts, with the exception 6f the 4th example on the 

 south ; and from between north and WNW the mercury 

 fell in both cases and-stood low. 



3d. Steeringalong the east coast, from Port Jackson to 

 the northward, in July, we hud the winds usually bc- 



t My friend Colonel Paterson, F.R.S. couimandcr of the troops at 

 Port JackbOH, in judging of the approaching weather by the rise and 

 fall in his barometer in the winter season, told me, that he had adopted 

 a rule directly the reverse of the common scale. When the nicreury 

 rose high, he was seldom disappointed in his expectation of rainy, bad 

 weather; and when it fell unusually low, he expected a continuance of 

 fine, clear weather, with wcstwardly winds. 



L 2 tween 



