1888.] S. A. Hill — Psyc7irometer and Condensing hygrometer. 



373 



Table I. — Hygrometric Observations. 













-\ 





Corrected 











Locality. 



Place of 

 Observation. 



Date. 



Hour. 



Readings. 



1 





i 



j2 



13 





o 



Ventilation. 



OD 



;^ 













pq 



pq 

 -p 



Ah 

 Q 



pq 

















H. M 



o 



o 



o 







. 



1 



Naini Tal. 



Verandah. 



May 



1 



10—30 



73-3 



56-0 



41-5 



23-70 



Light breeze. 



1— 1 



2 



Ranikliet. 



Obsy. shed. 



>) 



4 



11 



70-5 



51-8 



26-2 



24-10 



Calm. 



00 



3 



Badri Nath 



Open hillside. 



5} 



17 



15—40 



59-2 



49-7 



41-8 



20-59 



Fresh breeze. 



^ 



4 



Do. 



Do. 



55 



18 



13 



58-5 



46-1 



35-8 



20-61 



Strong wind. 



HH 



5 



Dobri. 



Do. 



55 



29 



11 



68-5 



58-6 



51-4 



22-45 



Calm. 





1 



Allahabad. 



Laboratory. 



April 



17 



11—15 



92-4 



67-2 



38-0 



29-40" 



Slight, from 

 punkha over- 

 head. 





2 



Do. 



Do. 



55 





12 



92-2 



67-2 



39-2 



29-38 



Do. 





3 



Do, 



CollegeCorridor 



55 





13 



104-5 



66 7 



35-3 



29-35 



Hot wind. 





4 



Do. 



Do. 



55 





13—15 



105-2 



66-7 



30-7 



29-35 



Strong hot 

 gust. 

 Calm. 





5 



Mnssoorie. 



Verandah 



April 



26 



15—15 



69-9 



54-2 



30-2 



23-56 





6 



Do. 



Do. 



55 





15—30 



71-3 



54-0 



26-7 



23-55 



Do. 





7 



Do. 



Do. 



55 





15—45 



71-4 



49-5 



19-9 



23-55 



Artificial 

 ventilation. 





8 



Do. 



Do. 



May 



1 



14—45 



59-8 



53-9 



48-0 



23-50 



Calm. 





9 



Do. 



Do. 



J) 





15—10 



60-3 



521 



45-7 



23-50 



Artificial 



. 























vent. 



1^ 



10 



Do. 



Do. 



)) 





15—20 



60-1 



53-2 



451 



23-50 



Very light 



> — - 



11 



Chakrata. 



In Doorway. 



» 



14 



13 



75-2 



57-7 



38-7 



23-39 



air. 

 Calm. 



)— 1 



12 



Deoban. 



Open forest. 



55 



15 



10 



64-3 



48-3 



32-3 



21-49 



Breeze. 





13 



Do. 



Do. 







10—20 



65-4 



48-6 



32-2 



21-49 



Do. 





14 



Lakwar. 



In Doorway. 



55 



17 



12 



85-1 



65-0 



44-5 



25-81 



Calm. 





15 



Do. 



Do. 



}} 





12—30 



86-8 



62-1 



436 



25-80 



Artificial 

 vent. 





16 



Dehra. 



Verandah 



June 



14 



13-30 



93-9 



71-2 



54-6 



27-52 



Light air. 





17 



Do. 



Do. 



55 





13—45 



94-3 



69-7 



52-3 



27-52 



Do. 





18 



Mnssoorie. 



Do. 



July 



2 



17—15 



69-3 



61-2 



53-8 



23 50 



Calm. 





19 



Do. 



Do. 



55 





17—30 



69-3 



59-6 



526 



2351 



Artificial 



vent. 





20 



Do. 



Do. 



55 





17-40 



69-3 



60-7 



52-V 



23-51 



Calm. 





21 



Allahabad. 



Laboratory. 



July 



28 



12—50 



80-1 



77-3 



75-8 



29-15 



Slight from 

 punkha. 





22 



Do. 



Corridor. 



55 





13—30 



79-4 



77-6 



76-S 



29-13 



Breeze. 



In Regnault's memoir, above referred to, what is known as the 

 convection theory of the psychrometer, first worked out by August, is 

 given. It assumes that there is a current of air, either vertical or hori- 

 zontal, that the air arrives in the vicinity of the wet thermometer with 

 the temperature indicated by the dry one, and goes away with the tem- 

 perature of the wet one, and that whilst in contact with the wet bulb it 



