M. Achille Caziii on Internal Work in Gases. 



199 



§ X. Influence of the dimensions and nature of the reservoirs. 



This influence is ascertained by the comparison of experiments 

 in which for the reservoir B either the cylindrical zinc vessel, 

 containing 33'805 litres, or the glass globe of 60*617 litres was 

 taken and the gas in reservoir A compressed under a constant 

 pressure^,. Thus we had in both cases the same mass of gas 

 expanding from the same pressure^, to the same final pressure p 1 . 

 But the mass of gas contained in reservoir B was different, as 

 well as the pressure p 2 . By increasing the capacity of the reser- 

 voir B the pressure jo 2 was increased, and also the mass of gas 

 compressed during the expansion. Let juu be the mass of the unit 

 of volume of the gas under the pressure^', and v the increase of 

 volume of the reservoir B ; the mass of compressed gas was in- 

 creased by v/jl, whatever the pressure p l ; it is the mass of 26*812 

 litres of gas at a pressure but little different from that of the 

 atmosphere. 



Series VIII. (November 1867). 



Dry hydrogen. Metal reservoir B. 



p l z=z^S0 atmospheres, jo 2 = 0'24 atmosphere. Temperature 

 between 7° and 11°. 



*• 1 h = +27 mm 



*=l-9 



72 



13 4 





34 





60 



-124 



-13 



+ 6 





+ 1 



... 







„ \e=2\ 



B -\h=~23 



31 



9 



14-3 



25 



29 



45 



60 



-36 



+ 16 



+8 



+3 



+2 



+ 1 







r J 0=2-1 



C 'tA=+4 



3-3 



61 



9-5 



13-2 



18 



30 



60 



-36 







+ 14 



+ 10 



+6 



+3 







» {9=2-7 

 1J '\h=-l 



3-8 



9-6 



15 8 



21 



35 





60 



-19 



+ 14 



+8 



+2 



+ 2 









F J °= 27 



3-9 



8-8 



10-7 



17 



25 



45 



60 



-1 



+ 19 



+ 14 



+9 



+5 



+ 4 







v j9= 0-31 

 ¥ -\h=-2 



41 



8-4 



14-4 



231 



37 





60 



-12 



+ 11 



+6 



+2 



+2 









r J 9= 36 



58 



9-9 



129 



16-2 



22-7 



33 



60 



+ 14 



+ 17 



+ 12 



+7 



+4 



+2 







nm 



5 



96 



14-5 



19-4 



. • . 



45 



60 



-4 



+ 13 



+ 10 



+5 



... 



+3 







Series II., previously mentioned, and Series VIII. afford an 

 example of comparison. The coordinates of the minimum are 

 h = — 124 millims., t = 2 seconds (Series VIII., zinc reservoir), 

 andA=— 67, t — 2 seconds (Series II., glass reservoir). We 

 have traced in fig. 6 the line X' X' which expresses the Series II., 

 and the line X X which expresses the Series VIII. 



The first meets the axis of the abscissa? two seconds later than 

 the second ; and the maximum of h in the first has scarcely more 

 than one-third of the value it has in the second. 



