DE. J. P. JOULE OX THE SUEEACE -CONDENSATION OE STEAM. 
149 
State of surface. 
No. 
Quantity of refrigerating 
water. 
Conductivity. 
Clean. 
57 
504-771 
334-13'" 
58 
497-9 
446-82 
59 
545-47 >544-81 
589-21 
>499-16 
60 
589-14 
564-26 
61 
586-75 J 
561-39 J 
Greasy. 
62 
474-595 
381-965 
63 
493-16 >503-42 
444-27 
>440-09 
64 
542-5 J 
594-05_j 
1 
The conductivity with the oiled tube, reduced to 544-8 lbs. of refrigerating water by 
means of the relation we have deduced, will be 450-6 : the closeness of this number to 
499-16 shows that the influence of a greasy surface is inconsiderable. 
The experiments 86 to 96 inclusive, are proper to determine whether any effect can 
be produced by placing a solid in the axis of the steam-tube. 
Description. 
Xo. 
Quantity of refrigerating 
water. 
Conductivity. 
Thin end of the 
90 
585-3 
278-075 
tapered rod upper- 
91 
>941-27 
433-62 
>438-95 
most. 
92 
963-88 p ' 
460-81 
93 
1230-24 J 
583-32 J 
Thick end of the 
94 
1007-88') 
325-875 
rod uppermost. 
95 
864-4 >938-04 
196-48 
>347-14 
96 
941-84 J 
519-07 J 
Selecting similar experiments, with the exception that the core was not present, we 
have 
^0. 
Quantity of refrigerating 
water. 
Conductivity. 
27 
739-8 ■) 
342-5 ■) 
28 
31 
7^‘7-l6 1 ygj-g 
797-34 
h39'39 
32 
691-69 J 
256-3 J 
The conductivity in the last instance, reduced to 940 lbs. of refrigerating water, will 
be 367-1, a number which does not differ sufficiently from 439 and 347 to lead us to 
expect any practical advantage from narrowing the steam space. 
Let us now inquire into the effect of changing the direction in which the refrigerating 
water was transmitted. Its usual direction was contrary to that of the steam and con- 
densed water; but by removing the pipe E (see figure) and pouring the water into the 
upper part of the outer tube C, it could be made to flow in the same direction. The 
experiments suitable for ascertaining the effect of changing the direction of flow are 
collected in the following Tables : — 
NDCCCLXI. Y 
