ay 
220 J. H. Alerander on the Tension of Vapor of Water. 
Table concluded. 
5 5 Pr: ure in inches of by 
ie. sp & a 3 
_ epee & > a $ i 
a3 Eee | 3 = 7 zi 50 
Bi. a5 £3 ex Zs of S es 
pe | f2e | | | Ge | ge) 
4 ee e & & = 
348° 254-51 278°33 : $ : 
350° 261- 290:35 . . 
352: 268-35 297°36 fis 
357-269 | 287-40 295-28 
362°66 8-13 316°35 
368°51 331° +342°51 i 
371-12 343-12 348: : 
372: 346-9 325° 
330°66 386-4 : 
389°345 | 429-78 433-83 
398313 | 48158 483 
3°043 | 506-35 511-31 
3:88 511-43 514-22 
405°041 518-41 2516-84 
407-615 34-30 76 
408-407 539-28 54085 
410°873 557-56 55369 
1 611-88 610-23 
423-257 39-87 635:95 
42503 652-93 644 96 
429-08 683-43 ant _ 676-49 i . 
706-12 . : ; Fs 620° 
435°227 731-92 : : 71613 ; ‘ 
Of the earlier oat ae in the preceding table, I need not 
say much. Those of Mr. Watt, which he suffered to lie by him 
for forty years, and, in the caustic phrase of “Tredgol ld, only pro- 
duced when they had become unnecessary, he was himself dis- 
satisfied with ; but as appears upon comparison, “with more mod- 
esty than reason. I have specially calculated but two or three of 
his temperatures ; and, of the whole sixty-two experiments, have 
inserted but twenty-two ; among which, however, both the limits 
= are to be found. Of his friend Robison’s, I have had to calcu- 
_ late none specially ; but all happened to find a place in the table. 
Ji Mr. Betancourt’s numerous observations which were reported 
y in degrees of Reaumur and F'rench inches, I have 
only those which have been reduced to English scales 
Sir D. Brewster for the Edinburgh Encyclopaedia. 
The experiments of Mr. Southern are, in fact, the supplement 
of those of Mr. Watt; having been rane and reported at the de- 
sire of the latter. The numbers will be found to differ, some ' 
from those generally found in: professed treatises on the 8 ear “en. 
gine ; they are in fact the mean of the actual observations ¥ 
those usually given, have been selected now from one a 
from the other set, yee reduced (by himself) to what pa 
we been, had t oC at 212° been thirty inches. - 
the present ll it seemed to me proper to state the ha not 
the possible, result 
ie 
