
332 C. G. KNOTT AND J. G. MACGREGOR ON THE 
TABLE VI. 
Temperature. M-N Deflection. 
134°C, 0 
87°7 13:9 
da ie 185 
118 1OR7 
123°8 20°7 

(1.) Alloy, 6 per cent. of which is Iridium. 
The deflections of the circuit containing this alloy being negative, its line is 
below that of N in the diagram. The relation between the deflections and the 
temperature of the heated junction of the circuit containing this alloy is given 
by the formula 
5 = —6°8675 + 393982 + ‘00073677’. 
The 4th column of Table V. shows that the deflections calculated from this 
formula agree with those observed up to about 390° C. Hence if 
oy dO. 
t= 10s 7p 39998 
and if 
t=300° C., © = 836 
From Table VI. we find that 
6, =const. + 1914¢. 
Hence 
an 
= 1914. 
The line thus determined will be found in Plate XXI. Its equation is 
y= —'154¢+ 2°13. 
(2.) Alloy containing 10 per cent. of Iridium. 
The deflections of column 5, Table V., being positive, the line of this alloy 
lies above that of N in the diagram. The formula showing the relation 
between deflection and temperature is as follows :— 
6 = —2'259 + '14172¢— 00012822”. 
The 6th column of Table V. shows the accuracy of this formula up to about 
390°C. Hence if 
ee ae 
t=, 0eCe = 14172 
and if 
t=300° C., “ —-06479. 

