444 
MESSRS. T. E. THORPE ARD J. W. RODGER ON THE RELATIONS 
test the validity of our experimental method as well as the accuracy with which the 
constants of the apparatus had been determined. 
The sample of water used was distilled just before its introduction into the glis- 
chrometer from a cpiantity wdiich had been repeatedly distilled in order to free it 
from dust. Special pains were taken in the final distillation to obtain a sufficient 
quantity of air-free as well as dust-free liquid. 
The details of the observation are stated below. On the left-hand side of the table 
are given the results obtained from observations made in the left limb of the giischro- 
meter, i.e., when the liquid was flowing from the left limb to the right limb. On the 
right-hand side are the corresj^onding results of observations in the right limb. In 
the first column is given the mean corrected temperature at which the observation 
was made ; in the second is the mean effective pressure in grins, per square centim. ; 
under Corr. is given the value in dynes of the correction for the kinetic energy of the 
liquid flowing through the capillary. Under -q, in the last column, is given in dynes 
per square centim. the value of the viscosity-coefficient after all corrections have 
been applied. 
In calculating the results, the values used for the density and expansion of water 
have been taken from the mean results of different observers given in Rosetti’s tables 
(‘Annales de Chiinie et de Phys.’ (4), 17, 370). 
Viscosity of Water between 0 ° and 100 °. 
Left limb. 
Rig 
rd 
rfl 
Temp. 
Pres.s. 
Coi’i’. 
>1 
Temp. 
Press. 
0 
0 
V 
5°47 
128-(34 
-0000237 
•014929 
5-44 
128-54 
•0000237 
•014949 
13-52 
128-65 
-0000300 
•011814 
13-54 
128-54 
•0000300 
•011801 
22-04 
128-64 
-0000370 
•009544 
22-00 
1-28-56 
•0000370 
•009556 
30-72 
128-48 
-0000447 
•007859 
30-73 
128-40 
•0000447 
•007861 
39-29 
128-39 
-0000527 
•006627 
39 35 
128-31 
•0000527 
•006618 
47-03 
128-70 
■0000605 
•005761 
47-03 
128-61 
•0000605 
•005760 
j 55-53 
128-07 
-0000690 
•005010 
55-54 
128-55 
•0000690 
•005010 
I (33-98 
128-73 
-0000777 
•004416 
64-05 
128-64 
•0000777 
•004412 
! 72-57 
128-73 
•0000870 
•003909 
72-51 
128-67 
•0000870 
•003921 
1 80-74 
128-81 
-0000956 
-003522 
80-76 
128-73 
•0000956 
•003526 
89-87 
128-85 
•0001052 
•003164 
89-94 
128-75 
•0001052 
•003167 
98-12 
128-90 
•0001144 
•002879 
98-06 
128-82 
•0001144 
•002899 
99-97 
128-90 
•0001160 
•002859 
i 91-51 
128-79 
•0001150 
•002845 
The results of these observations are graphically rejiresented in Plate 8 ; viscosity 
coefficients X 10’ being taken as ordinates and temperatures as abscissae. 
By taking 
7]^ — 0’14939 7^3 = ‘002889 773 (calculated) = ‘006569 
b = 5°‘45 b — 08°‘09 b (from curve) = 39°‘72, 
