24 8A'l I'll MED STEAM, AMD OTHER VAPORS. 



Other Data. For con\ mii-nce the following data are assembled : 



Length of the metre in inches , J 89 ' 3702 < H S 0r8 > 



( 39.3701.::.' (Clarke) 



_dit of the kilogramme in pounds . . . 46*126 



iit of 1 litre (1 en. decimetre) <f mercury . 13.5959 kilos, 

 tons power, in foot pounds per Moood . .vo 

 Cfttvofd vopeuj. in kilugrammetres per second . ::, 



(!iun. .f mercury. 

 * kilo* per .q.m. 

 I- in. 

 21 1 ;.:;_' Ibi. per. sq. ft 



{.-' O- /I 

 '_ .' 



Explanation of the Tables. In Table I. the first column gi\> tin- tnu- 



irc. /. of -aturatcd steam. 



The second column gives the correspond in.L r pressure, p, in pounds on tin 

 square inch, above an absolute vacuum : the differ, 

 the two numbers from which they are derived. 1, i .\ample. the j 

 at 40 F. is 0.121T, pounds per square inch : and the. dil; ;.j be used in 



interpolation, and placed half a line lower, is 48. 



The third column gives the heat of the liquid, qr, required to raise the 

 temperature <>f one pound of water from 32 r F. to a given temperature. 



The fourth column gives the total hes*\ X, required to ra pound of 



water from 32 F. to a given temperature, and to entirely vapori/.e it under 



pressure due to that temperature. 



The fifth column gives the heat of vaporization, or the heat required to 



rize one pound of water at a given temperature, under the pressure 

 corresponding. 



The sixth column gives the heat required to do the disgregation work 

 during the vaporization of one pound of water. 



The seventh column gives the heat required to overcome the external 

 pressure, and do the work of increasing the volume from <r to s. 



The eighth column gives the entropy of the liquid. 



The ninth and tenth columns give the specific volume, or volume in cubic 

 feet, of one pound of saturated steam, and the density or weight of 

 cubic foot in pounds. 



Table II differs from Table I in that it is arranged to give the \ 

 of saturated steam for each pound of pressure. 



Table III gives the properties of saturated steam in French units ; and 

 Tables IV to XI give the properties of other saturated vapors in the sam* 

 units. It is to be noted that the pressures in Tables IV to IX are in milli- 

 metres of mercury; in Tables X and XI, are in kilogrammes per square 

 metre. 



