Part II.— OCEANOGRAPHIC TABLES 



Table I.— EXPANSION CORRECTION, C, FOR PROTECTED THERMOMETERS OF K:=6,100 FOR VALUES OF 7"+ V. 



AND T'-t. 



(From Schumacher, 1923) (4) 



{T' + V.) + {T'-t)-[ 



,^|-(r'+K4(7::-oj|-^^( 



K J 



where, 



T' = reading of the protected reversing thermometer, 

 < = corrected reading of the auxiliary thermometer, 

 V„ = volume of mercury below the 0° C. mark in the reversing thermometer, expressed in degree units, 

 if = reciprocal thermal coefficient of expansion, taken equal to 6,100. 



Example: 



Given, T' = 4.09° C, t=U.l° C. and Fo = 80° C. 



Then, r-<=- 10.01° C. and r+F, = 84.09° C. 



From table I, C=— .14° C. (expansion correction, C, will have the same sign as T' — t). 



C is to be added with the index correction to T' to give the corrected reading of the protected thermometer. 



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