NO. 17.] 



HYGROMETERS. 



17 



Hygrometer II. 1894. Spring. 

 1894. March 17. Corr. = 2 % (sat) on board 



Apr. 2. 8 - (sat) - 

 - 4. -2- (sat) -=- 



Hygrometers I and II, from June, 1895. 



1895. June 



July 



August 



Sept. 



Oct 5. 



1896. May 17-31. 



June 

 - July 



Con-. = 



= 2-2 % 



+ 0-6 - 



+ 1-0 - 



2-3 - 



+ 3-9 - 



+ 4-6 - 



+ 6-0 - 



+ 7-3 - 



Corr. = 



n 

 n 

 it 



n 



n. 



-0-0% (ps) 



-0-5 - - 



1-1 - - 



4-3-1 . - 



-3-5 - - 



1-4 - . 



4-3 - - 



n screen. 



In the winter, the hygrometers were often covered with hoar-frost, and 

 it was necessary to have them thawed and cleaned. This operation did 

 not seem to affect their reading in any appreciable degree. When a hygrometer, 

 after having been cleaned, was brought out into the open air, it sometimes 

 showed too low, but soon attained its true working position, and the reading 



