490 
MR. E. H. GRIFFITHS ON THE VALUE OF 
The values of J deduced from the different groups (using the numbers given by the 
respective smooth curves) are, however, in much closer agreement, the extreme 
divergence being less than 1 in 4000 (see Table XLIII.). 
It is worth mentioning that in previous years we found the agreement between 
individual experiments in the same group (having the same E.M.F.) was closer than 
that shown in the above Table ; but, on the other hand, the values of J and of the 
water equivalent given by different groups (or by members of the same group when 
the number of cells was changed), differed hopelessly, in some cases by more than 
1 per cent., showing that constant causes of error had not been eliminated. We 
attribute the improvement (l) to the alteration in the form of stirrer, for the 
mechanical work done in previous years varied capriciously, although no doubt the 
thermometer bulb was more thoroughly “washed” than before the alteration; (2) to 
the correction (now introduced for the first time) for the difference between the 
temperature of the wire and that indicated by the thermometer. 
As it is more convenient to examine the values of T for integral values of the 
temperature, we have read off from the smooth curves the values of T for every two 
degrees covered by our range, and also the values at 15° C. and 25° C. These are 
given in the following table. 
Table XLI.—Values of T from Smoothed Curve. 
Temperature. 
Series I. 
Series II. 
Group B. 
W = 188-065. 
Group E. 
W = 277-931. 
Group A. 
W = 139-776. 
Group C. 
W = 199-674. 
Group D. 
W = 259-500. 
14-000 
557-04 
740-44 
458-77 
580-90 
702-88 
15 
557-14 
740-46 
4.58-87 
580-95 
702-91 
16 
557-24 
740-48 
458-97 
581-01 
702-95 
18 
557-43 
740-55 
459-16 
581-13 
703-00 
20 
557-62 
740-60 
459-35 
581-25 
703-05 
22 
557-80 
740-66 
459-53 
581-37 
703-11 
24 
557-99 
740-72 
459-72 
581-49 
703-17 
25 
558-09 
740-75 
459-81 
581-55 
703-20 
26 
558-18 
740-77 
459-92 
581-61 
703-2-2 
1 
2 
3 
4 
5 
6 
Taking the data given in Columns 4 and 6 of the above table, Ave giAm an example 
of the final calculation of our results. 
Using the notation of pp. 478-481, Ave ]ia\m the following A^alues 
