//( MiniTY RllCORni.RS 



253 



I'hc liahmciiiR of this bridge acrordinjjly acconiplishrs the result 

 aireiui>' deserihcd of detenuiniiiK llie ratio of the resistances R\ and ^2 

 of these two sHde wire arms, and consequently, the relative humidity 

 corrcsjxinding to the dry and wet bulb tcm[icratures previously 



Fig. 11 — Direct Reading Recorder 



measured on their rorrespf)nding bridges. In the operation of the 

 recorder, a period of about 20 seconds is allowed by the commutator 

 to balance each bridge thus completing a cycle every 60 seconds. 



The recorder is equipped with two pens one of which is associated 

 with the slide wire of the "dry bulb i)ridge" thus recording the dry 

 bulb temperature, while the other pen is associated with the "humidity 



