O'T 



70 



METEOROLOGY. 



[Sect. IX. 



to be sedulously avoided 

 any of these particulars 



Whenever an a 



Iterati 



ion m 



is indispensably necessary, it 



should be done as a thing of moment, with all delibera- 



tion, scrupulously noted in the registerj and the exact 



^ 



amount of change thence arising in the reading of the 

 instrument (whether by alteration in its zero point, or 

 otherwise) ascertained. 



2. As far as possible registers should be complete: 

 but if, from unavoidable causes, bbnks occur, no attempt 

 to fdl them up subsequently from general recollection, or 



f which is worse 



\ 



falsification) 



apparent course of the numbers before and after, should 

 ever be made. The entries in the register made at the 

 time of observation should involve no reduction or correc- 

 tion of any kind, but sliould state the simple readings off 

 of the several instruments, and other particulars, just as 

 observed. This does not of course prevent that blank 

 umns left for reduced and corrected observations 



co=^ 



1-=' 



X 



sliould be filled up at any convenient time. On the 

 contrary, it is very de " " 



the sooner after the observation, consistent with due 

 deliberation, the better, on every account, unless some 

 datum be involved requiring subsequent discussion for 

 its determination. 



3. Tlie observations of each kind should, if possible, 

 all be made by one person ; but as this is often imprac- 

 ticable, the deputy should be carefully instructed by his 

 principal to observe in the same manner, and the latter 

 should satisfy himself by comparative trials that they 

 observe alike. 



4. If copies be taken of registers, they should be care- 





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