THE MECHANICAL EQUIVALENT OF HEAT. 
41,3 
Table XV, 
c°. 
R (pentane). 
R (water). 
Difference.* 
13'6.32 
8-5420 
8-5419 
+ -0001 
14-010 
8-5520 ? 
8-5528 
--0008? 
14-982 
8-58-22 
8-5818 
+ -0002 
16-202 
8-6161 
8-6148 
+ -0013 
17-161 
8-6456 
8-6456 
4- -0000 
18-214 
8-6770 
8-6766 
+ -0004 
19-164 
8-7051 
8-7046 
+ -0005 
20-502 
8-7444 
8-7444 
+ -0000 
21-702 
8-7799 
8-7794 
+ -0005 
23-001 
8 8181 
8-8176 
+ -0005 
24-699 
8-8683 
8-8676 
+ -0007 
24-713 
8-8689 
8-8680 
+ •0009 
Mean difference = ’0004, 
showing a rise of about ^ when in pentane. 
The specific heat of pentane is so small that it is possible that the wire would be 
at a slightly higher temperature than when in water, as it would not be robbed so 
rapidly of the heat supplied by the current, and thus some portion of the small rise 
observable might be due to this cause. 
The following tables give the resistances used by us for the reduction of our “ J ” 
experiments :— 
denotes the resistance when the current is so small as to produce no visible 
change in R. 
(Rq = R, as deduced from Table XIIL, diminished by '0034, see p. 396.) 
Re, R 2 E, &c., the resistance wdren the difference of potential at the ends of the coil 
is that due to 1, 2, &c., Clark cells. 
(Rne = 1^0+ ^^^ 0 ) where SRg = ‘00421 X n‘^ true ohms, see p. 406.) 
Table XVI.—Series II. Values of R. For Series I. subtract ‘0038. 
ct 
R,). 
ftjE- 
ItsE- 
R4E- 
R 5 E. 
Roe- 
14-477 
8-.5626 
8-5794 
8-6012 
8-6.307 
8-6686 
8-7149 
15-581 
8-5959 
8-6127 
8-6337 
8-6632 
8-7011 
8-7474 
16-682 
8-6282 
8-6450 
8-6660 
8-6955 
8-7334 
8-7797 
17-683 
8-6578 
8-6746 
8-6956 
8-7251 
8-76.30 
8-8093 
18-688 
8-6876 
•8-7044 
8-7254 
8-7549 
8 7928 
8-8391 
19-835 
8-7214 
8-7382 
8-7592 
8-7887 
8-8266 
8-8729 
21-115 
8-7592 
8-7760 
8-7970 
8-8265 
8-8644 
8-9107 
22-409 
8-7972 
8-8140 
8-8350 
8-8645 
8-9024 
8-9487 
23-862 
8-8399 
8-3567 
8-8777 
8-9072 
8-9451 
8-9914 
25-006 
8-8735 
8-8903 
8-9113 
8-9408 
8-9788 
9-0250 
* The differences in the last column show a slight tendency to increase as the temperature rises, 
Indicating a decrease in the resistance of water. 
