180 PROF. OSBORNE REYNOLDS ON 



mately constant after falling some considerable amount 

 below the initial temperature. In these last experiments, 

 therefore, it would be expected that the discharge might 

 be estimated as taking place at nearly constant tem- 

 perature. 



The intermediate experiments would give intermediate 

 results. 



According to this view, for the high pressures, since 



and 



dp dp . . 



Pi Pi ^ 



or putting V for the volume 573 cub. in. of the discharg- 

 ing vessel, 



Q, dp. , . 



V^=*7i^^, (^'^ 



where t is the time. Or, since tdp=^ lbs., 



K='-M (22) 



Pit 



Substituting the value of pj, in the first six experiments, 



we have : — 



^« 

 p. K. Velocity Yn~- 



at orifice. P 



135 "825 1022 650 



130 "826 „ „ 



"5 '835 



120 '820 „ „ 



115 '810 „ „ 



1 10 790 



For the first three of these experiments K is nearly con- 

 stant, showing that the conduction of heat could have but 

 slight if any effect, but the effect is decidedly apparent in 

 the next three. 



