SOME MKKCURY STANDAKl>s >F I ; KM STANCE, ETC. 7: 



That is 



S|/S - 50/59-0027. 



Ami -in. . Si = -555374 sq. millim., therefore S, = -555349 sq. millim. 



It will l>e observed that it is the differences 1 - x and 1 - y which are most readily obtained from the 

 calibration curves. 



The determined values of /', (1 - /), /", and (1 - y) are contained in the expression in column 15 of 

 Table III. In order to find f and /", the distances of the mark from the ends of the till*: arc required. 

 These distances may )>e obtained from the data in Table XVII. The estimated values of S, are tabulated 

 in column 16 of Table III., and the length for one international ohm (obtained by means of the equation 

 on p. 71) is given in column 17. 



VOL. CCIV. A. 



