Given 23.214 Next greater 23.456 22.974 Next less 22.974 ------ ------ .240 Difference .482 .240 And ---- = .5 .482 Temperature opposite next less 199.0 ----- Temperature required 199.5 ===== A similar method of interpolation in taking out numerical quantities is applicable to almost all tables; and should be practised with all those given in this work. _Example._--Thus, in Liverpool, lat. 53 deg. 30' N., the barometer reading 29.876 inches, its attached thermometer 55 deg., and the correction of the instrument being + .015 (including index error, capillarity and capacity), what temperature should be assigned for the boiling point marked on the thermometer? Observed barometer 29.876 Correction + .015 ------ 29.891 Correction for temperature - .074 ------ Reduced reading 29.817 Factor from Table V. 1.00077 ------- 208719 208719 29817 ----------- Equivalent for lat. 45 deg. 29.83995909 =========== In Table VI., 29.84 gives temperature 211 deg.86.