452 MESSRS. T. E. THORPE AND J. W. RODGER ON THE RELATIONS 
Taking 
7 ^-^ — *005220 173 = *004401 773 (calculated) = *004793 
= 0°*72 ^3 = 15°*36 ^2 (from curve) = 7°’80, 
we obtain 
28T55 
— (140-89 + ’ 
which gives results in good agreement with those obtained by observation. 
Mean temp. 
'/• 
Difference. 
1 
Observed (mean). 
Calculated. 
0 
0-72 
-005220 i 
•005220 
•000000 
5-09 
•004954 
•004952 
-•000002 
9-15 
•004720 
•004722 
+ •000002 
11-87 
•004578 
•004577 
-•000001 
15-36 
•004401 t 
■004401 
•000000 
Hydrocarbons. 
Pentane. CH3.(CH2)g.CH3. 
The specimen of normal pentane used by us was supplied by the late Professor 
ScHORLEMMER. Pe-distilled from sodium wire, it boiled between 36° and 38°. Bar. 
765-5 millims. Corrected and reduced b.p. = 36°-3. 
The observations for viscosity were as follows :— 
Left limb. 
Rig 
bt limb. 
Temp. 
Press. 
Corr. 
Temp. 
Press. 
Corr. 
V- 
0 
0-77 
99-80 
•000064 
•002802 
0 
0-71 
99-73 
•000064 
1 
•002808 
7-46 
99-79 
•000068 
•002617 
7-48 
99-72 
•000068 
•002623 i 
1313 
99-78 
•000071 
■002480 
13-20 
99-73 
•000071 
•002482 : 
18.89 
99-76 
•000U74 
•002352 
18-93 
99-69 
•000074 
•002351 
26-40 
99-71 
■000078 
•002188 
26-21 
99-68 
•000078 
•002195 
30-38 
99-73 
•000080 
•002111 
30-44 
99-69 
•000080 
•002110 
i 32-65 
1 
1 
99-69 
•000081 
•002072 
32-67 
99-62 
•000081 
•002069 ; 
■ 
Perkin’s value for the relative density, (Z(15°/15°) — 0*63373 (‘ Chem. Soc. Trans.,’ 
1884), and the expression 
V “ 1 H- *0ol4646f + -0/09319/2 + -0/6084/^ 
