VHi* 



vt -^i. 



t 



Cd 



I 





• -♦.» 



tl 



L.. 



*^ 



I 



Sect. IX.] 



METEOROLOGY 



29 



Fa 



o 



Fb, that at two fathoms depth : the latter not bemg taken 

 more than once a day, except when Fa indicates some 



sudden change. 



G will contain the direction of the wind, per vane ana 

 compass, in its first column, Ga ; and its force, as read off 

 on the anemometer, in Gb. If there be an upper and 

 under current of wind, both their directions should be set 



lik 



H 



He 



the 



amount of cloud in the region from the zenith down to 

 0^ of altitude, and lib for the amount below that alti- 



cighth parts 



of the whole 



( which 



tude, each estimated in 



respective areas of sky included in the two regions '^w 



are equal), according to the best of the observer's ji 



ment. He will contain the prevalent character of cl 



according to the nomenclature of Howard ; denotin 



C cirrus, by K cumulus,'^ by S stratus, and by N nimbus, 



by double letters their combination in transition from one 



) 



(tbus, K, 





the prevalence of one 



species of cloud in one and another in the other region. 

 Two layers of cloud, one above the other, may be denoted 

 by placing their characteristic letters above and below a 

 line in the manner of a fraction. These forms of cloud 

 are thus characterized :— Cirrus expresses a cloud re- 

 sembling a lock of hair, or a feather, consisting of streaks, 

 wisps, and fibres, vulgarly known as mares' tails. Cu- 

 mulus denotes a cloud in dense convex heaps or rounded 



* To avoid the otherwise inevitablt; confusion of C and c in MS. 



^ ■* 



f ^ 



