( 576 ) 



The \";iliies of /' liaxc Ixtmi Ixn-rowod tVoiii tlio \\('ll I^hoanh cxpc- 

 riiueiits of Amagat ^). 



The loo ]ai'oe values of A iji ihe l)egi]i]HJi,U' — here oiilv toal>oiit 

 300 atiii. — are still i>reseiil. This indicates [jrohahlv that the vahie 

 a = 300 is still slightly too gi-eat. Hut fi-oin 300 atiii. upwards the 

 agreeineiit is (|uite satisfaetorv. Small iuacciiraeies in the determina- 

 tion of the value of /• have for large volumes a great inlhienee on 

 the values of />. To this circumstanee also it may he ascribed tliat 

 the values of h are in the hegiiuiing not reliable. So the value 

 r = 10(390 at y> = 100 cannot be accurate to a higlier degree tlian 

 to ten units at the utmost. So it might also have been 10680 or 

 10670 and h or r — (/• — />) might have been 10 or 20 nnits smaller. 

 The values of 1> "calculated" have been delennined with the aid 

 of equation (1) in the assumption 



/^;^917 ; h^ = 463. 



/>„ may be determined in the followijig way. If we sul>s(iiuU' 

 into (J) 



^'.7-^ 



and pay i-egard lo /'—/»„=:- (l>,, — h), then we get for (1): 



.^* h,j — /' 

 \—.v T^ — -*' ' 

 and therefore: 



i)„ — h 1 — ,v 



r — b ,r 



For an a>suuied vahie of A,, this e(pia(iou eiial)h:'s us to determine 

 the correspon(üng Aalue of ,/■ from /• and h at e.g. 500, 1000, 1600, 

 2200, 2800 aim. The value of /^, may then be calculated from 



which follows immediately from (1). So 1 found with A,, = 917 at 

 1000, 1600, 2200, 2800 atm. resi)ectively the values /y„ = 455, 463, 

 462, 466. If we put r/^400 instead of ^/zzi:300, then we find with 

 A,, 31=1000 at y> = 2800 atm. in the same way A„ = 463. With 



1000 atm. tlio values of r at (1UÜ, 700, 800, 900 and 1000 aim. represent the 

 mean values of the results of tlie lirst method (that of the electrical contacts) 

 and those of the second metliod. From 1100 atm. upwards the values of r have 

 been determined by the tirst method. 



1) Mémoires sur l'élasticilé el la dilalajjiülé des flnides .ius(|u"aux tres haules 

 pressions, p. 3:2 — 33 and 3^. 



