302 



METEOEOLOGY. 



[Sect. IX. 



I 



i 



I 



1 



i 



I 



and ruled in corresponding columns, to receive the cor- 

 rected and reduced results of the raw observation 



s in 



Form I. This should have the column ^^ as in Form 

 I ; B will consist of a single column : viz. the barometer 

 reduced to 32 ; C, of the same number as in Form I 

 containing the corrected thermometer readings ; under D 

 will come two columns. Da and Db^ of which the former 



Iry and wet 



will contain the corrected difference of th 



e ( 



bulb readings, and the latter the value of F^ the elasth 



force of vapour at the dew-point by the formula alread] 



given. E and F will merely contain the corrected valuei 



of the corresponding entries in Form I ; and if there be 



anything in the remaining columns requiring correction 



or reduction, it will here, of course, be done ; if not, 

 those columns must be either carefully copied or simply 

 referred to. In this form should be entered, when needed^ 

 the monthly means of the several columns (in calculating 

 w^hich care should be taken to verify the results by repe- 

 tition) ; and it is recommended, before adding up the 

 columns, to look down each to see that no obvious error 

 of entry (as of an inch in the barometer, a very common 

 error) may remain to vitiate the mean result. The pre- 

 caution should also be taken of counting the entries in 

 each column, so as to muke no mistake in the divisor. The 



^xxima 



iC 



and ranges of the instruments 



should also be entered. Except, however, the ship has 

 been nearly stationary during the month, these calcula- 

 tions and their results are of little utility. 



T^oth forms should be headed with the year and month 

 on every page, and should bear the name of the ship and 



Li^erver^ 



f 



f 



1 



i 



1 



] 



i 



i 



i*. 



