= 
teading of only. the maximum et inctes which ea 
the actual temperature of the water in the boiler.» For.the pre 
3 ti rp 
322 J. H. Alezander on the Tension of Vapor of Water. 
gree of Fahrenheit; they are, therefore, not comparable in pre- 
cision, whatever they m may be in accuracy, to those that have 
just been considered. And as but one reading either of tempe- 
rature or pressure is given in each instance, they do not allow of 
tpine treated in the method that has just now been applied. — I 
an only then compare them as in the following table: si 
Temperatur Differences ey e 
Pressures Calculated EN “Oval Calculated Frank. Inst. 
in by my by formula of jin’formala and 
Atmosph’rs. Jormuias ¥’ host: Fran Inst. | Frank. Inst. experiment. — ; 
we QPL closed 212 a ae 
0 8 250 -52 250 248 +8 os fe 
975-73 275-18 275 972 -3 2: Jak a 
3 293 -72 291 -5 990) +] BD Be ic 3 
309 -57 307 54 304 +5 304 -4 +0 +1 : 
320 -36 © 315 -5 16-5 —1-0 : 
333 °49 331 -70 326 327 -3 —1 ‘Sena 
343 -36 - 341 -78 336 336 °4 —0°45 1 
= 30 300 78 345 44 -B° +0825 
ie: | aa 360 -36 308 ;88 302 °5 352 °5 — 
7 Mean differences, ae 20 —3°-45 40° 36 
The temperatures of the Academy in this table, were mots as” 
has been said already, from experiments at the precise epochs of 
pressure ; but were interpolated from experimental, terms not re= 
mote. Under a general principle, I excluded them from the Com- 
parative Table in the preceding Memoir, but they satisfied even 
the fastidiousness of Mr. Dulong, as representing accurately the” 
results of observation ; and are.therefore fit to be compared as s they, 
are here. The last line of mean differences. shows the excess. of 
‘ the formula-temperatures above those of the Academy, to be not 
much more than one-third of the excess of the latter above those 
of the Franklin Institute; the probability,.of accuracy of these 
last then, at most, cannot be more than in the same ratio. J, 
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