( 484 ) 
Dilatometer Dilatometer Dilatometer 
Temperature TI NO, Ag NO, 51 mol. pCt. Ag NO, 
36°.6 24.1 22,5 57.8 
BI 31.9 28.3 52.3 
312 35.9 31.4 49.5 
28°.6 40.8 35 46.1 
These dilatometers were now cooled down to about 10°, left at 
that temperature for about 20 hours and then again heated to the 
original temperatures to see whether any change in volume had 
taken place. 
In this way the following numbers were obtained: 
31° 35.9 31.4 34.4 
TINO; and Ag NO; have, therefore, undergone no alteration whilst 
the volume of the mixture has greatly diminished. 
The transition temperature of different mixtures was determined next. 
Rise of level with mixtures of 
Temperature. Time 40 pCt. 50 pCt. 60 pCt. 70 pCt. 
in hours, Ag NO, Ag NO, Ag NO, Ag NO, 
34°.4 4 ee HAES oe A Md Belg ee 
30°.9 4 FEE PO NE 
27° 6 Es TL DENG BIE RIA 
26° 6 — 0.35 — 0.4 — 0.2 — 0.3 
24° 3) — 1.4 — 1.4 — 1.2 — 1.5 
19° 1 — 14 — 2.0 — 18 — 1,6 
With mixtures of 20 percent and of 80 percent of AgNO; 
it was possible to determine that the transition temperature lies 
between 24° and 29°. 
It, therefore, appears that all the mixtures have the transition 
temperature at 26°—27°. It will have to be proved by solubility 
experiments whether at this temperature, the double salt changes 
into another modification or breaks up into the components. 
The following groups of phases exist in the different regions in- 
dicated in the figure: 
I. TINO, « + Melt. II, Ag NO, a@ + Melt. 
Ill. TINO, /? + Melt. IV. AgNO, 2 + Melt. 
V. TINO, + Double salt. VI. AgNO; + Double salt. 
Region VII will contain the group Tl NO; 3 + Ag NO; /, or 
will have to be divided into two parts representing the conditions 
of existence of each of these salts with the new modification of the 
double salt. 
