HEAT OF EVAPORATION OF WATER. 317 
temperature must have approximated more nearly to the external temperature. His 
numbers are as follows (‘ Wied. Ann.,’ vol. 37, 1889, pp. 502-4) :— 
Taste XT V.—DrerTerici’s Experiments. 
(597-29 
597-19 
595-99 
Table ot ae acs 
| 95°74 
| 596-51 
(597-06 
597-07 (with lower pressure) 
TAPIEELVE 4 PMPS\ -4 eacie 
Mean of all experiments 596-73 
in platinum tubes . . 

His own summary of these results is as follows :— 
“ Die Versuche mit dem Platingefiisse ergeben 
(P= Oya} 
mit einem wahrscheinlichen Fehler des Mittels von + 0°13.”* 
REGNAULT performed forty-four experiments at temperatures about 100°. Of 
these he rejects Nos. 1 to 6, as merely preliminary ; the remainder areas follows. It 
should be remembered that the numbers in this table give the values of the “ total 
heat,” not those of L. 
Taste XV.—ReEGNAULT’S Experiments. 




Experiment. | Temperature. | “Total heat.” || Experiment.| Temperature. | ‘Total heat.” 
| 7 99:49 | 6368 26 10022 6372 
8 | 99-46 | 636°3 27 100-37 636-1 
9 | 99°31 636-4 | 28 100-32 636° 
10 9928 637-6 29 100-32 637-3 
11 10019 | 636-0 30 100-31 63671 
12 10019 636'8 31 7 100,22 635-6 
13 100-19 638'3 32 100-22 636-9 
| 14 100-19 | 637-9 | 33 100-26 635-9 
15 10019 | 635°9 | 34 100:26 635°9 
16 | 100-26 625°9 | 35 99-09 635°7 
17 10026 | 637-9 | 36 99-09 63671 
18 100-26 637-9 3 99-07 636-6 
19 100-26 | 635°6 | 38 99-07 636-9 
20 100-26 635'8 39 99-36 636-1 
21 10026 | 636°7 | 40 99-36 636°8 
22 | 10022 | 637-6 | 4] 99-33 637°3 
3 100-22 638°4 | 42 99°33 636-4 
24. 100-22 636°8 43 99-27 635°7 
25 10022 | 636°6 44, 99-27 636°8 
Mean. . 99°88 636°67 









* ‘Wied. Ann.,’ vol. 37, 1889, p. 504. 
