14 GENERAL SCIENCE 



ily sensations which different relative degrees of temperature and 

 humidity cause, is interesting and instructive. Families, schools, 

 factories, and public institutions will find it a valuable guide for the 

 regulating of humidity. 



75% Relative Humidity 



TEMPERATURE BODILY FEELING 



55 F Very cold 



65 F Chilly 



75 F Comfortable 



85 F Too Warm 



95 F Very Hot 



50% Relative Humidity 



35 F Very cold 



50 F Chilly 



65 F Comfortable 



75 F Warm 



85 F Too Warm 



95 F Very hot 



30% Relative Humidity 



55 F Very cold 



65 F Chilly 



75 F Comfortable 



85 F Warm 



95 F Too warm 



105 F Very hot 



The ordinary form of hygrometer, an instrument for measuring 

 the relative humidity of the atmosphere, may be easily con- 

 structed. 



Construction of Hygrometer. Two thermometers are mounted 

 on a board about four inches apart, one of which is exposed to the 

 free air, the other having its mercury bulb covered with a few 

 strands of loosely twisted lamp wick or silk which extend down 



