CORRECTION FOR THE TEMPERATURE OF THE EMERGENT 

 MERCURIAL COLUMN OF THERMOMETERS. 



T = t — 0.0000S6 «(/' — /) — Fahrenheit temperatures. 

 T = t - 0.000155 n{l' — t) — Centigrade temperatures. 

 T = Corrected temperature. 

 t = Observed temperature. 



t' — Mean temperature of the glass stem and emergent mercury column. 

 n — Length of mercury in the emergent stem in scale degrees. 



When t' is \ —r f than t the numerical correction is to be \ j-— — '- \ 



lower ) I added. ) 



Table 7. 



CORRECTION FOR FAHRENHEIT THERMOMETERS. 



Values of 0.000086 «(/' — /) 



Table 8. 



CORRECTION FOR CENTIGRADE THERMOMETERS. 



Values of 0.000155 «(^' — 



Smithsonian Tables. 



14 



