ELECTRICAL STANDARDS. 165 
TABLE II.—continued. 
| Total Heat | 
ars | Total Heat | oe 
py from 4B? Dist Ls | 7c from 4:2xT Differ- 
| U° to 1° | eeee | | 0° to T° puce 
y IV. eek VI. 
137716 | 577-27 | 57607 | +1:20 172766 | 728°47 72517 + 3°30 
137°27 57796 T6538 PASe |) UTZ 75 730°82 (255d + 5:27 
138-27 | 581-58 580°73 r °85 172°71 730°68 725°38 + 5°30 
17266 | 730°59 (25°17 + 5:42 
Vv. 
15368 | 646-44 | 64546 | + -98 | VII. 
154:30 | 651-97 | 650°16 +181 || 179°23 78970 | 75277 + 6°93 
15561 65427 | 653°56 + ‘Tl || 183°56 T7657 770°95 +562 
156782 660°89 | 65864 — 2°25 i 186-00 787°34 781:20 +614 
158°82 668°38 | 667-04 +1°34 || 186°65 79162 | 783-93 +769 
159719 669°64 668°60 +104 | 186°89 790°86 78495 +591 
160°34 675:°74 / 673°43 +2°31 | 187°75 795°35 78855 + 6°80 
160-61 67761 | 674°56 +305 || 190°36 80580 799-51 + 6:29 
A curve based upon these means as accurate would show a minimum 
ordinate above 100° C. Without any definite experimental reason I have 
considered this as outside the range of probability, and have drawn a 
curve corresponding to a gradual increase of specific heat between the 
limits of the experiments, viz., 107° and 190°, which fairly connects the 
means. Continuing that curve beyond 107° to 100°, and reading off from 
it the value of the total heat minus 4:2 x T at intervals of 10° we get the 
following result :— 
Tasie III.—Total Heat of Water between 0° and T° (Air Thermometer) 
according to Regnault and Rowland. 
Ly ~ fe) fo) 
| z Tosa ae Geet Excess over 4:2 x T 
QO 
100 420-68 “68 
110 462°73 ‘73 
120 504°80 *80 
130 546°88 *88 
140 589-04 1-04 
150 631-40 1-40 
160 674-02 2°02 
170 71752 3°52 
180 761:60 560 
Whence we obtain— 
Mean specific heat of water between 0° and 100° is 4:2068 Joules 
=1-0016! thermometric units. 
Mean specific heat of water between 0° and 180° is 4:2312 Joules 
=1-0075' thermometric units. 
‘ It will be remembered that Regnault gives for these two values 1:0050 and 
1 0133 respectively. 
