Steam of Maximum Density. 



185 



AlogP,= log^t! 



= fe ( 1 + i)- i { 1 _4; + b 



V a J L a + t (a + 



B s 



(«+*)* («+o 5 



+- 



...}, 



the values of the coefficients B„ B 2 , &c. being the same as in 

 the original formula for log P* expanded in a series. The above 

 series being of great convergence will often be found useful in 

 supplying defects from using logarithms to seven places of deci- 

 mals, when logarithms to ten places are not at hand. In the 



formula for log V t one of the factors, viz. ] 1 — I 1 + - J | , is 



sometimes incapable of being correctly expressed beyond the 

 fifth decimal place by means of the ordinary Tables of loga- 

 rithms to seven places. 



Table I. — Elastic Force of Steam of Maximum Density, and 

 rate of Increment per degree, according to Regnault and ac- 

 cording to a new formula. (Regnault's Table, p. 624, vol. xxi. 

 Mem. de I'Academie, fyc.) 



Temperature. 



Elastic force in 

 hundredths of 

 one atmosphere. 



Increment per 

 degree Centigrade. 



Fahren- 

 heit. 



Centi- 

 grade. 



Abso- 

 lute. 



New 

 formula. 



Regnault. 



New 

 formula. 



Regnault. 



-22 



o 



-30 



246 



049 



•051 



•09509 



•09326 



- 4 



-20 



256 



121 



122 



•08676 



•083C0 



+ 14 



-10 



266 



•278 



•275 



07943 



•07979 



32 







276 



•595 



•605 



07296 



•07359 



50 



4-10 



286 



1-198 



1-206 



06722 



•06645 



68 



20 



296 



2-286 



2-288 



06210 



•06179 



86 



30 



306 



4156 



4151 



05753 



•05744 



104 



40 



316 



7235 



7-224 



05342 



•05346 



122 



50 



326 



1211 



1210 



•04972 



•04980 



J 40 



60 



336 



19-58 



19-58 



•04638 



•04646 



158 



70 



346 



30-66 



30-67 



04335 



•04339 



176 



80 



356 



46-65 



46-66 



•04060 



•04060 



194 



90 



366 



6912 



69-14 



03809 



03808 



212 



100 



376 



100-00 



10000 



03580 



•03571 



230 



110 



386 



141-53 



14150 



03370 



•03373 



248 



120 



3 l J6 



196-32 



196-22 



03177 



03175 



266 



130 



406 



267-33 



26715 



03000 



•02999 



284 



140 



416 



357-88 



357-59 



•02837 



•02836 



302 



150 



426 



471-64 



471-22 



•02685 



•02685 



320 



160 



436 



612-59 



61205 



•02546 



•02547 



338 



170 



446 



785-04 



784-44 



02416 



02418 



356 



180 



'456 



993-53 



992-96 



02293 



•02298 



374 



190 



466 



1242-9 



1242-5 



•02184 



•02187 



392 



200 



476 



1538-2 



15380 



•02080 



•02083 



410 



210 



486 



1884-5 



1884-9 



01983 



01985 



428 



220 



496 



2287-3 



2288-2 



•01892 



•01894 



446 



230 



506 



2751-8 



2753-5 



01807 



•01809 







Phil. Mag. S. 4. Vol. 29. No. 195. March 1865. 



O 



