BETWEEN THE VISCOSITY OP LIQUIDS AND THEIR CHEMICAL NATURE. 445 
we obtain the formula 
5-9849 
~ (43-252 + t)™ ’ 
The agreement between the Observed and Calculated values is seen in the following 
Table:— 
Mean temp. 
V- 
Difference. 
Observed (mean). 
Calculated. 
o 
5-45 
-01494 
•01494 
•00000 
13-53 
-01181 
•01179 
- -00002 
22-02 
•00955 
•00951 
- -00004 
30-72 
•00786 
•00784 
- -00002 
39-32 
•00662 
•00662 
•00000 
47-03 
-00576 
•00577 
+ -00001 
55-53 
■00501 
•00502 
+ -00001 
64-01 
•004415 
•00442 
+ -000005 
72-.54 
•003915 
•00393 
+ -000015 
80-75 
•003525 
•003535 
+ -00001 
89-90 
•003165 
•003165 
•00000 
98-09 
•00289 
■ -00289 
•00000 
100-00 
■00283 
•00283 
•00000 
Moritz (‘ Pogg. Ann.,’ 70,1847) from observations made by the method of Coulomb 
(oscillating- disc), inferred that water had a maximum viscosity in the neighbourhood 
of 4“. Other observers, and more especially Poiseuille and Sprung, using the tube 
method, were unable to detect any peculiarity in the rate of change of viscosity at 
temperatures at about the point of maximum density. 
We have made a special series of observations to test this question, the results of 
which are seen in the following table ;— 
Viscosity of Water between 0° and 8°. 
Left limb. i 
1 
1 
Right limb. 
Temp. 
Press. 
Corr. 
'/• 
Temp. 
Press. ; Coer. 
'/• 
1- 13 
2- 41 
4- 47 
5- 94 
7-41 
130-16 
130-26 
129-935 
129-95 
129-98 
•000021 
•000022 
•000023 
•000024 
•000026 
•017094 
•016395 
•015351 
•014639 
•014006 
0°37 
1-86 
3-09 
3-84 
5- 19 
6- 67 
8-01 
13001 
130-04 
130-10 
129-83 
129-82 
129-845 
129-87 
•000020 
•0000215 
•000022 
•000023 
•000024 
•000025 
•000026 
•017570 
•016701 
•016079 
•015678 
•015005 
•014331 
•013766 
