Section 39. The Conductivity Data. 83 



Table 18. Ratio of specific volume at various temperatures to that at 4. 



39. THE CONDUCTIVITY DATA. 



Table 19 contains the conductivity data obtained in the separate experi- 

 ments. The first column contains the date; the second, the cell-number 

 which by reference to section 32 shows the modification of the conduc- 

 tivity-vessel used ; the third, the concentration at 4 in milli-equivalents per 

 liter, the international atomic weights for 1905 being employed, and the 

 fourth, the true temperature (/) of the measurement upon the hydrogen- 

 gas scale. The fifth gives the concentration at the temperature of the 

 measurement obtained from that at 4 by dividing it by the appropriate 

 specific volume ratio taken directly from table 18 or derived from the 

 values there given by linear interpolation and by correcting it (at 281 

 and 306) for the solvent in the vapor-space as described in section 31. 

 The sixth column contains the actual conductance in reciprocal ohms of 

 the solution in the bomb, which was obtained by correcting the observed 

 conductance for the resistance of the lead-wires and for errors in the 

 resistance coils and slide wire. The seventh column gives the corresponding 

 conductance-capacity of the vessel, determined as described in sections 35 

 and 36 ; when no number or quotation mark is inserted it is to be under- 

 stood that the value used was the same as that given for the same temper- 

 ature in the preceding experiment. The eighth column gives the equiva- 

 lent conductance in reciprocal ohms, which was computed by subtracting 

 from the actual conductance X 10 6 (given in the sixth column) that of 

 the water (as given in section 35), multiplying the remainder by the con- 

 ductance-capacity (given in the seventh column), and dividing by the 

 concentration at t (given in the fifth column). 



