652 
FREDERICK GUTHRIE ON THE THERMAE RESISTANCE OF LIQUIDS. 
s. 
Resistance mean of 
five experiments, 
millims. 
2-5 
63-00 
3-0 
66-09 
3-5 
71-74 
4-0 
80-16 
4-5 
86-04 
5-0 
92-97 
5-5 
95-22 
6-0 
99-78 
6-5 
102-82 
AR millims. 
3- 09 
5-65 
8-42 
5- 88 
6- 93 
2- 25 
4- 56 
3- 04 
It is seen, on comparing the numbers of column AE millims., that there is a continual 
increase of resistance with the thickness, but it would not be safe from these numbers 
to attempt to deduce any law (see fig. 6). 
§ 52. Relation of resistance to time t x and temperature . — In another series of experi- 
ments a set of brass cones were employed having brass bottoms. The depression when 
they were in contact was not measured. The interval h can only be considered approxi- 
mately as 2 millimetres, but it was perfectly constant throughout. For these reasons the 
numbers given can only be compared inter se. The necessary reductions are made for 
pressure. The depression produced by the passage of water of a certain temperature 
through the upper cone was allowed to attain a maximum, and then water of a known 
higher temperature was passed through. The water in the interstice was brought to a 
uniform temperature by stirring with a slender wooden splinter. The numbers are 
given in the units of the arbitrary scale (1 H= 4-826 millims.). 
H=37 
T=13°-06 
AT= 5°-55 
o=2 millims. circa. 
T 
f 9 
— T=5°-5o. 
H r 
T 2 — T 1 =5°-55. 
s 2 . 
T -T=5°-55. 
Ha- 
T — T =5°-55. 
h 4 - 
t 5 -u=i 
K 
1 min. 
47 
71 
llO 
146 
180 
2 
55 
84-5 
122 
156 
192 
3 
58 
89-5 
128 
160 
196 
4 
59 
91-0 
129-5 
161 
196 
5 
60-5 
91-5 
130-5 
161 
196 
6 
61 
92-2 
131 
7 
61 
92-5 
131 
8 . . 
. . 92-5 
131 
9 . . 
. . 92-5 
131 
10 . . 
. . 92-6 
