1117 
TABLE Ill. 
Volume of | gr. Volume of 1 gr. « Difference 
Temperature | of potassium of potassium (hundredths 
| in Dilatometer 1 in Dilatometer 2 of mm.3) 
Age RS ea Ea a aes 
0° | 1. 15665 1. 15692 21 
50.2 | 1.17110 ree) Det 7 
50.1 | BOBs ae 1.17134 26 
41.1 | 1.16829 1.16863 | 34 
49.7 | 1.17097 | 1.17129 | 30 
B51 | 1.17607 Ut) 4; eA 
58.2 | 1.18611 1.18755 | 144 
19.7 1.16199 1.16223 | 24 
0 | 1.15650 | 1.15680 30 
52.7 | ecg ee 42 41SAT eatin Hy Nid 
52.8 | 1.17258 | 1.17312 «| 54 
ee oh tose REA PR AN 
59.8 | 1.19170 | 1.19348 | 178 
59.8 | 1.19457 | 1.19693. | 236 
60 1.19643 {2108770 hak 
60 | 1.19734 1.19976 | 242 
59.7 | 1.19593 1.19918 | 32 
59.6 | 1.19353 | 1.19575 322 
ee 1.20480 1.20495 | 15 
(liquid) (liquid) 
54.25 1.17452. | 1.17611 | 159 
(solid) | (solid) 
6. As long as the dilatometers have not been exposed to tempe- 
ratures higher than 53°, the differences remain small and nearly 
constant (24—24 units). At higher temperatures they become large 
(up to 325 units). However, if we go back to O° C., the difference 
has become the same (30 units) as it was before at the same 
temperature. From these data it follows that there has occurred in 
one dilatometer or in both a reversible transformation. That it has 
taken place in the solid metal, is evident from the fact that the 
difference is again very small (15 units) after the metal has been 
melted (at 64°.6 C.). If the metal is now cooled to 54°.25 (at which 
