RECENT DETERMINATIONS OF THE VISCOSITY OF WATER. 191 
of the apparatus,’ seemed to leave little to be desired, and the 
results are remarkably consistent. But so also are Slotte’s which 
give very different values for the fluidity at the higher temperature. 
At the suggestion of Bodington, Thorpe and Rodger have called 
the efflux apparatus for viscosity measurements the glischrometer.* 
5. Relative Fluidity about the temperature of maximum density. 
-—In my former paper, Section 25, p. 139, I shewed that between 
the limits 0° to 10° C., the fluidities deduced from combining 
Poiseuille’s, Graham’s, and Sprung’ s observations indicated a curve 
of the form 
l+ar- Br? 
and as the sign of the coefficient 8 was + in a more extended 
temperature limit, there was an inflexion in the general curve. 
Thorpe and Rodger’s work does not shew this peculiarity, and I 
think disposes of the supposition. The following table in which 
the first column gives the observed, and the second the computed, 
values from the formula 
= 1 + 002257 + 0:00057?......... (1) 
will make this obvious. 
Relative Fluidities of Distilled Water 0° to 8° C.; computed 
from Thorpe and Rodger’s viscosity measurements— 
Temp. Observed. Computed. Temp. Observed. Computed. 
0° 1000 1000 4-5 1157 1156 
05 10141 1016 5 11762-1175 
: 1033 1033 5D 1190 1194 
15 1050 1050 6° Tort. 1918 
1067 1067 6:5 123%. 1333 
2:5 1085 1084 7: 1251 1252 
3° 1101 1102 7:5 "1270 1272 
3°5 1119 1120 8 12898 1292 
* 1138 1138 13°53 1503 1531 
Norre—Poiseuilles values :—1 1015: 21177: 3 1287. 
1 Phil. Trans. Vol. 185, p. 413. 
2 Evidently from Sle tae gluey or viscous. 
