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304 



METEOROLOGY. 



[Sect. IX. 





Occasional Observations. 



There is much and most valuable matter for meteoro- 

 logical observation and remark which cannot find a place 

 in the regular entries of a register^ either from its occa- 

 sional nature^ or from its statement requiring more 

 detail than is consistent with the brevity of such entries. 

 Observations of the Actinometer are of this kind, and 

 require a separate register. Such also are all meteoro- 



logical phenomena of a transitory nature, as hurricanes 



thunderstorms, waterspouts, auroras, &c., of all which 

 special and connected statements should be drawn up 

 (embodying all notes made at the time) as soon after 



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their occurrence as possible, and entered in a diary, care- 

 lly noting all circumstances connecting them with the 

 state of the atmosphere preceding and subsequent, and 

 especially every precursory appearance or fact which 

 may have left on the observer's mind the impression of a 



, Such also are those occasions of which the 



attentive observer will not fail to take advantage, when 

 particular meteorological sequences of cause and effect 

 stand out in unusual prominence, or when opportunity is 



offered for the exact or ai 



.s 



determination of 

 ome datum of scientific interest. The following hints 

 respecting observations coming under these descriptions 

 will be worth attendina: to. 



Squalls^ Storms, 



Hur 



hardl 



icanes or Cyclones. — It is 

 y necessary to impress on the nautical observer the 

 xtreme importance of a minute attention io every adjunct 

 of these formidable phenomena. From their first indi- 

 cations they should be attentivelv watched in all their 





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