94 



HYDKAULICS AND ITS APPLICATIONS 



line production, and gives the loss usually found where a pipe is led out 

 of a reservoir by means of a sharp-edged junction. 



ART. 36. Loss CAUSED BY A DIAPHRAGM IN A PARALLEL PIPE. 



Much work in this direction has been done by Weisbach, to whom the 

 following experimental results are due. 

 With a diaphragm having an aperture a leading from a reservoir of 



( A } 2 v z 



large area into a pipe of area A (Fig. 46), calling the loss ] 1 [ 



C a ) & 



FIGS. 46 and 47. 



= F ~ , the following values were obtained. Here C c a = area of 



*j ^7 



vena contracta. 



With a diaphragm inserted in a pipe of area J. (Fig. 47) the following 

 values were obtained. 



/ A -V 1 v 2 *; 2 



Loss = ( 7^ l ) - = ^ - . 



\C C a / Zg Z g 



