176 MARINE BAROMETER. 



^, . higher than usual for five days, and durino; this time the wind 



Observations , « ., , • r \^^^t , i . , . 



and inferences blew with more regularity irom JN W , the only exception being 

 to ascertain the [q^ ^ few hours in the .afternoons, when it commonly sprung up 

 correspondent ^ ^, ..,„ . ^, ^ , 11 



changes of ""<^''" the JNlJi, in the manner or a sea breeze: the weather re- 

 wind andwea- mained fine during these five days, and the height of the mer- 

 ther, to be ex- j -.,> ^ . 



pected after cury averaged 29,94. 



change in the 4th. In the neighbourhood of Cape Arnhem, the mercury 

 mSeT ^^'°' ^^"^J'y stood about 29,90, whether the wind was from NW, 

 NE, or east, if the weather was fine ; but if by chance the 

 wind shifted to the south side of west, off the land, it descended 

 to 29,80 though tlie weather remained the same: and this was 

 its standard during those times when strong gusts came from 

 the NW accompanied with heavy rain, thunder, and fight- 

 ning . 



In this example, the wind from SW occasioned the mercury 

 to stand lower than that from NW in the same weather; 

 which is contrary to what was observed upon the south and 

 east coasts ; particularly on the former, where the south-west 

 wind elevated the mercury up to, and sometimes above 

 30,25. 



5th. On March 6, 1803, we made sail off from the north 

 coast, towards Timor, the north-west monsoon having ceased 

 to blow at Cape Arnhem, and the eastwardly winds appearing 

 to have set in ; but we soon outran them, and had the wind so 

 variable and light afterwards, that it took us twenty-three days 

 to reach Coepang Bay, a distance of no more than 12" of lon- 

 gitude. The only two remarks I made upon the barometer 

 during this passage were, that the common height of the mer- 

 cury was 29,95 at those times that the wind remained steady 

 for some hours, from whatever quarter it came, and about 

 29,85 when it was most unsettled ; and that it stood higher, 

 upon the average, after we had passed Cape Van Diemen, 

 when the south-west winds, which blew oftenest, came from 

 the sea, than it did before. 



The medium height of the mercury, deducting the time be- 

 tween Cape Maria and Groote Eyland in the 2d example, 

 I should take at 29,92, which, when the quantity of rainy 

 squally weather, with thunder and lightning, is considered, is 

 very high: the whole range of the mercury upon the north 

 coast was four-tenths of an inch, 



Th« 



