RECENT DETERMINATIONS OF THE VISCOSITY OF WATER. 193 
Relative Fluidities 0° to 100° C.—continued. 
4 : ; ie N. TR. Com- 
Temp. 1846 1861 1877 1883 1886 1886 1894 puted. 
> 34057) 1080 ......2,° 1574*. -1567* 157TH 1662 . 167 
ev-atis) 1706........ 1785. 1768: : 4796-1772 AIS 
25 1992 2021 .... 2005* 1977* 2020 1992 200 
Oy ear0, 2240. .:., 3233 2206 3383 3295 298 
35° 2479 2493...  2473* 2445* 2484 2466 247 
40 2738 2758 2730 2717 2685 2726 2716. 272 
45 3010 3018 3020 2961* 2917* 2974 2976 298 
60 -..2°. 8808 ©3970" 3914. 3144 ©5214 9946 —S25 
55 ws 83549 «3540 3477* 3368* 3479 3517 353 
60... 3834. 3720 3744 3589 © 3763 3797 382 
65 4165 3980 4017* ... iis AOSG ALD 
70 4461 4210 4294 4385 443 
75 4430 4571* 4693 
80 4620 4849 5003 
85 5128* 5316 
90 5460 5409 5633 
EE oa oe - BGpe a 69S 
Ls ene 5988-23 6282 
* Values obtained by parabolic interpolation. 
An examination of the table and of the experiments from which 
the values given are deduced shews :— 
(a) That the relative fluidity has been ascertained to within 1% 
from 0° to 50° GC. 
(6) That from 50° to 100° C. the uncertainty increases to 57. 
(c) That this large uncertainty is apparently not explained by 
possible errors of observation either of temperatures, efflux times, 
Or of the dimensions of the apparatus. 
(d) That determinations of viscosity, to the order of precision _ 
0-1%, will involve an investigation of the cause of the large dis- 
erepancies in previous results. ; 
(¢) That between the limits 0° and 70° C., the relative fluidity 
may be expressed to two places of decimals by the formula 
SJ’ = 1 + 0:0357 + 0-0002r?......... 2) 
bad between 0° and 7° C. to three places of decimals by formula (1) 
ereinbefore given. 
M-—Sept. 2, 1896, 
