8 



Reynolds, Dryness of Saturated Steam. 



\ 



} at A, 



\ 



y at B, 



/ 



P 1 '=pressure, 



T/ =temperature, 



Y 1 '= volume per lb. of fluid, 



H/ — P/Vi^mechanical equivalent of heat 

 per lb. of fluid, 



^ 1= =velocity of fluid 



P 2 '=pressure, 



T 2 ' =temperature, 



V 2 '=volume per lb. of fluid, 



H 2 ' — P 2 'V 2 r =mechanical equivalent of heat 

 per lb. of fluid, 



w 2 =velocity of fluid 



and H ? =the mechanical equivalent of heat, per lb. of fluid 



passing through, received through the surface. 



Then H 1 '+-^+H / =H 2 '+^- (i). 



Also, if the fluid at A consists, per lb., of 



51 lb. of steam and (i — S T ) lb. of water, 

 and at B consists of 



5 2 lb. of steam and (i — S 2 ) lb. of water, 



and if hi and h 2 are put for the mechanical equivalents of 

 heat per lb. of water respectively at the temperatures, 

 Ti and T 2 , of saturated steam at pressures of P/ and P 2 ' 

 respectively, then T 1 ' = T l , where P/ and T\ are pressure 

 and temperature corresponding to the initial state of 

 saturated steam at A, and T 2 may be taken to correspond 



