386 



Mr. W. Sutherland on Thermal 



parameters in (19) are, with the mm. of mercury as unit of 



pressure, 



( V2 +^ 1 )/2(r 2 -r 1 ) B' A' 



Air 16 -0094 0*0 



H 2 12 -0022 0-0 



C0 2 16 -012 0-0 s 5 i.e. -000005 



These give the following comparison : — 



((P 2 +Pi)V - 764 328 217 94-0 



AirJ^-i^cal. ... 59 5'0 4-4 3'1 



li>2-J»i ex P- ••• 6>1 51 4 " 3 30 



H, 



CO, 



'(p*+Pi)/2 



p 2 -p L cal. 



P2-P1 ex P- 



'(P2+P1)/ 2 

 p 2 -p l cal. 



P2-P1 ex P- 



767 330 

 23-8 16-0 

 234 15-2 



764 495 362 



37 3-8 3-8 



33 4-1 4-1 



190 

 11-2 

 11-2 



267 

 3-7 

 3-8 



108 

 73 

 71 



50-8 

 22 

 20 



50-8 

 3-8 



23-1 

 1-2 

 1-1 



25-4 



20 

 2-0 



12-7 



•7 

 •9 



127 

 10 



203 

 3-5 

 3-3 



114 

 2-9 



2-8 



508 25-4 127 

 20 121 -7 

 2-0 1-3 10 



With the meerschaum plate III., having a thickness of 

 11-2 mm. and with the jackets at 100° and 17'6°, the para- 

 meters are : — 



(v2+i\)/2(v 2 -v l ) B' A' 



Air 18 -0094 O'O 



H 2 16-6 -00181 0-0 



whence the comparison 















fQ> 2 +i>i)/2 



.. 787 



698 



508 



317 



209 



198 



86-4 



Air i P2-P1 cal. . 



.. 5-2 



5-1 



4-8 



4-1 



3-9 



3-8 



2-7 



[P 2 -2h^V- 



.. 5-6 



5-4 



5-4 



4-4 



37 



34 



2-3 



Kf,+1HV2 



.. 50-8 



35-6 



21-1 



102 



711 



4-82 



3 81 



Air \p 2 -piCdl. 

 U 2 -Pi ex P- 



.. 1-9 



15 



10 



•52 



•37 



•26 



•20 



.. 1-6 



1-3 



1-0 



•63 



•49 



■37 



•39 



[ iP2+Pl)P 



.. 864 



762 



470 



290 



193 



121 



76-2 



H 2 ji> 2 -Pical. 



.. 20-3 



19-2 



153 



11-5 



8-6 



6-0 



4-0 



[P2-P1 ex P- 



.. 201 



19-5 



159 



117 



8-0 



56 



40 



Up 2 +Pi)/2 



.. 43-2 



27-9 



25-4 



16-5 



15-3 



8-13 





H 2 j^ 2 -^i cal - 



.. 2-4 



1-6 



1-46 



•96 



•90 



•48 





[P2-P1 ex P- 



... 27 



1-6 



1-68 



•82 



■96 



•58 





With the stucco plate I., having a thickness of 6*3 mm. 

 and with the temperatures of the jackets at 100° and 18 0, 4 

 (17° for H 2 ), the parameters are : — 



