152 
DE. J. P. JOULE ON THE SUEEACE-CONDENSATION OF STEA3I. 
No. 
Head of 
water. 
Quantity of refrigerating 
water. 
Conductivity, 
97 
1-5 1 
563-78 1 
337-121 
98 
1-0 >1-83 
661-64 >669-58 
427-66 >413-02 
99 
3-0 J 
783-31 J 
474-29 J 
If we contrast these results with those obtained with the same tubes unfurnished with 
spirals, we shall find 
No. 
Head of 
water. 
Quantity of refrigerating 
water. 
Conductivity. j 
3 
2-271 
758-9 1 
195-681 
4 
2-4 
798-16 
191-86 
5 
0-94 
591-01 
152-24 
6 
1-33 
>1-43 
631-85 
>661-34 
184-3 
>166-27 
7 
1-03 
594-47 
149 44 
8 
0-94 
597'01 
138-79 
9 
l-08_, 
657-99^ 
151-6 ^ 
pronng that a great increase of conductivity was obtained by the use of the sphal, with- 
out entailing the necessity of a much higher head of water. 
The effect of increasing the velocity of the spirally directed refrigerating water will 
appear from the following experiments : — 
No. 
Head of 
water. 
Quantity of refrigerating 
water. 
Conductivity. 
124 
8-4 J 
135-8 1 
531-591 
125 
4-47 >6-22 
117-06 >128-97 
522-6 >528-91 
126 
5-8 J 
134-06 J 
532-54 J 
121 
176 1 
691 6 1 
859-4 1 
122 
207 >192 
855-6 >774-77 
872-28 >820-93 
123 
193 J 
777-1 J 
731-1 J 
whence we find Coc(W)^'“^®. 
By classifying the experiments so as to show the comparative effect of transmittmg 
the refrigerating stream in the same direction with, and opposite to, the steam and con- 
densed water, we obtain the following Table : — 
