





330 C. G. KNOTT AND J. G. MACGREGOR ON THE 
The close agreement between the observed and calculated values of 6 speaks 
for the accuracy of the formula. 
Hence 
“ = -636 +-001124¢; 
If, therefore, 
dé 
t=. 0 C.,7, =1696, 
and if 
jy COE 
t=300° C., 5 = 9782. 
From the observations of Table IV. may be deduced the equation 
6,=const. + 181377, 
whence 
We are now able to find = for ¢=0° and ¢=300° C., and thus the position 
1 
of the line on the diagram is determined. It will be found lettered AgPd,, 
on Plate XXI. This mode of writing is adopted to show readily the composition — 
of the alloy. The number expresses in all cases the percentage of the substance 
whose symbol is written second. Thus AgPd,. means the alloy, 20 per cent. 
of which is palladium. 
The equation to this line is readily found to be 
y = —'124¢— 26°83. 
(2.) Alloy of which 25 per cent. 1s Palladium. 
The signs of deflections being the same as in the case of the former alloy, 
the lines of M and AgPd,,; are also on opposite sides of the N line. 
The equation deduced from the above observations is as follows :— 
d= —10°206 + °71189¢+ :00084577. 
The column of calculated deflections shows in some cases somewhat large | 
differences, but in number the differences are about equally divided between 
those which are greater and those which are less than the observed results. 
Hence 
© = "71189 + ‘0016914¢ ; 
if, therefore, 
t=) OE ae ‘71189 
ie cae i 
and if 
f dé 
t=300° C., — =1-21931. 
As before, 
celine 
eee ET, 
