1030 
dt 
— between 1 and 1000 k.g. per cm.’ yields 
dp 
for the first filling + 0.0078 
for the second filling + 0.0079 
The temperature determinations were made with thermometers 
compared with standard ones tested at the Reichsanstalt; the mano- 
metrical determinations were controlled with the large pressure 
balance ') of the van DER Waats fund; the observations are accurate 
to about 10 k.g. and 0.°05. 
The substances used in these experiments, were identical in pre- 
paration and properties with those used by one of us (T.) on a for- 
mer occasion’); only the decane (di-isoamyl) and the tri-ethylamine 
have been used here for the first time. These two substances have 
been purified by fractional distillation (the tri-ethylamine over sodium), 
they presented the following physical constants: Freezing point: 
Decane — 52°,5 Triethylamine — 114,75; boilingpoint 160°,05 + 0.10 
resp. 89°5 + 0°02; d0°/4° 0.73852 resp. 0.74585 = 7. 
It may finally be mentioned that all the observations have been 
made by one of us (T.). 3 
§ 4. Results obtained : 
| TABA EL 
| Hexane + nitrobenzene 
Press. in kg. 3) EEn | at 
per cm.2 Plaitpointtemp. | dp per kg. 
1 20°.81 + 0°.03 | 
| — 0°.0164 
| 100 49,17 4004 
| | — 0. 0127 
| 250 A B (ET 00) 
— 0. 0083 
425 15. 82 + 0. 05 
— 0. 0051 
625 14,80 = 0.05 
— 0. 0031 
825 14. 18 + 0.03 | 
For a comparison we give the results obtained with a Cailletettube: 
1) See above p. 1025. 
2) These Proc. I. ec. 
3) All the pressures and temperatures have been corrected to the standard ther- 
mometer and the pressure balance. 
