Table 9. 



CORRECTION FOR THE TEMPERATURE OF THE MERCURY IN THE 



THERMOMETER STEM. 



7^= t — 0.0000795 n {f — t) — Fahrenheit temperatures. 

 T^=t — 0.000143 '^ {^' — ^) ~ Centigrade temperatures. 

 T^= Corrected temperature. 

 t = Observed temperature. 



/'' ;= Mean temperature of the glass stem and mercury column. 

 n = Length of mercury in the stem in scale degrees. 



CORRKCTION FOR FaHRENHKIT ThKRMOMETKRS. 

 Values of 0.0000795 n (t' — t) 



Correction for Centigrade Thermometers. 

 Values of 0.000143 n {t' — /) 



When t' is 



/ greater \ 

 ( less J 



than I the correction is to be 



f subtracted "( 

 i added / 



12 



