134 



A MANUAL OF TOIMMJKAlMIir METHODS. 



Table II.- — Correction for r — r', or difference in the temperature of the barometers nt tin- tiro stations. 



[ This correctioi 



in (Kiti Y( \\ 'lu'ii tin.- attached thermometer at the upper station is lowest; positive when tin- attached 

 thermometer at the upper station is highest.] 



Taisle III. — Correction for the difference of gravity in various latitudes. 

 [Correction positive from latitude 0° (..45 : ; negative from 45° to 90°.] 



