- -fll'i^-^— 





iT+ 



1 



1 



I 



208 



METEOROLOGY. 



[Sect. IX. 



Z, Rej 



and opposite to every page ruled for 



blank i 



Under 



o 



o 



e; 



ia will 



indicate the day of the month (marking the Sundays with 

 S, and the days of new, full, and quarters of the moon 

 wdth their appropriate marks #, s, c^ c) ; and 



Ab will 

 contain the hours of observation in each day, following 



the civil reckoning of time, 



B will contain two sub -headings, Ba^ Bb^ correspond- 

 ing to columns in w^iich are entered respectively the 



readings of the barometer and its attached thermometer. 



C will contain three : viz, Ca for entries of the ex- 

 ternal thermometer ; Cb^ the daily maxima ; and Cc, the 

 daily minima, placed opposite to the hours at which they 

 are read oft" on the self-registering thermometer. 



D will have two, Da and Db : viz. the readings of the 

 dry and v^et bulbs of the hygrometer. 



Under E will stand three 



o 



ub-columns, Ea for solar, and 



the 



Eb^ Ecj for terrestrial radiation. Ea will contain 

 readings of the black-bulb thermometer exposed in the 

 exhausted tube to the sun at such of the regular hours 

 when it can be observed ; Eh those of the thermometer 

 exposed to clear sky in the metallic reflector; and Ec 

 those of a similar tliermometer placed close beside it, and 

 iu all other respects similarly exposed. In these columns 

 may also be entered the observed maxima of these ele- 

 ments, whether obtained by watching the instruments or 

 by self-registering ones ; and these observations should 



be distinguished from the others by enclosing them in 

 parentheses, or miderlinlng them, &c. 



Pwill contain the temperature of the surface -water. 



