(46) METEOROLOGICAL TABLES. [aVV. N'' I. 



REMARKS 



ON THE FOREGOING 



METEOROLOGICAL TABLES. 



J. HE winds in the preceding Tables, are estimated from 

 the true north, being in all cases corrected by the application 

 of the variation of the compass. 



In the first three years, 1807, 1808, and 1809, the dat/ 

 commences at twelve at noon, according to the usual nauti- 

 cal estimation, and is twelve hours earlier than the day by 

 civil reckoning ; but the time, in every succeeding year, is 

 the civil day, commencing at twelve at night. 



Those Latitudes and Longitudes^ having an asterisk 

 annexed to them, were deduced from celestial observations, 

 and are consequently accurate. The others, being from 

 estimation, are liable to some error ; but nothing sufficient 

 to affect the general results. 



In the Tables for the first three years, the column 

 superscribed " Thermometer,'''' consists only of a single daily 

 observation ; but as this observation was intentionally made 

 at a different hour almost every day, and as often near the 

 hour of mid-night as of mid-day, it is presumed that the 

 mean temperature derived therefrom, will be very nearly 

 the same as if more observations had been registered. In 

 these three Tables also, the Barometer is merely marked 

 once a-day, and that at the time of noon. 



In the last nine years observations, however, the Ta- 

 bles are more complete ; the columns headed " Barometer,'''' 

 including the daily extremes, and those entitled " Thermo- 

 meter,'''' consisting of the result of three or four daily obser- 

 vations. But as common Thermometers only were used, 

 the extremes of temperature that occurred may not be al- 

 ways shown, excepting when these extremes were remark- 

 able ; in which case, I was very particular in registering 

 them. As all these observations on the temperature, were 

 made at irregular hours of the day and night, they will 

 doubtless afford a very close approximation to the mean 

 temperature. All the thermometers used, were graduated 

 according; to Fahrenheifs scale. 



For the sake of brevity, m the two columns of " Winds,"" 

 I have distinguished the progressive veering of the 



