8 



Reynolds, Dryness of Saturated Steam. 



Pj^pressure, 



TV =temperature, 



V 1 '=volume per lb. of fluid, 



Hx' — P 1 'V 1 '=mechanical equivalent of heat 

 per lb. of fluid, 



^=velocity of fluid 



at A, 



P 2 '=pressure, \ 



T 2 '=temperature, I 



V 2 '=volume per lb. of fluid, I R 



f at x3, 

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

 per lb. of fluid, 



w 2 =velocity of fluid 



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



passing through, received through the surface. 



Then 



H 1 '+^L+H / =H 2 , +=3- 

 2£ zg 



(i). 



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



Si lb. of steam and (i — Sj) lb. of water, 



and at B consists of 



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



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

 heat per lb. of water respectively at the temperatures, 

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

 respectively, then T 1 f =T 1 , where P/ and 1\ are pressure 

 and temperature corresponding to the initial state of 

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



