3IO Mr. Haldane Gee and Dr. A. Harden on 



then 



(Vi-.;^)Pi = (V2-^)P2 



_ViPi-V2P2_ Pi(V2-Vi) 



""" P1-P2 " ' P1-P2 

 The volume of the cylinder employed was ascertained 

 by the hydrostatic method to be 11-828 cb. cms. 



JExperhnents with ist Instrument. 



Vi V2 Pi Pi -Pa X 



(i) i6*39 27*66 762*9 541*2 11*78 



(2) i6*39 33*oi 762*9 59*3 11-79 



(3) i6*39 37*86 762*9 626*9 11*73 



Mean 11-77 

 The error here is -06 cbc, or *5 per cent. 



Dilatation experiments with second instrw7ient. 



Vi Va Pi Pi -Pa X 



(1) 15*10 26*16 764 588*2 11*80 



(2) 15-10 26*16 764 588*9 11*82 



(3) 15*10 26*16 764 588*3 ii*8o 



(4) 15-10 26*16 764 588*6 11*81 



Mean 11 -81 

 The'^error here is only "02 cbc, or *i7 per cent. 

 The pressure experiments were carried out in a similar 

 manner, the glass plate being secured in its position by the 

 screw E (Fig. 6). In this case, of course, the mercury was 

 set at the lowest constriction, and then forced up to the 

 next, and so on. 



P2 being greater than P^, and Vj than Vg, the equation 



becomes : — 



^ ,, Pi(Vi-V2) 







,A, — 



'' P2-Px 









Vx 



V. 



P2-P1 



Pi 



X 



(l) 

 (2) 

 (3) 

 (4) 



48-31 

 48-31 

 38-31 

 38-31 



38-31 

 38-31 



26*16 

 26*16 



287-7 

 287*6 



644*0 



644*4 



764 

 764 

 764 

 764 



11-75 



11*74 



1175 

 11*76 



Mean 11-75 

 The error in this case is *o8 cbc, or *7%. 



