EXAMPLE. 



203 



SCH. 3. When the edges are rounded off so the contrac- 

 tion is very gradual, the loss of work is very much dimin- 

 ished. 



EXAMPLE. 



What is the discharge through the orifice in Fig. 57, 

 when the head is 1 feet, the diameter of the contracted 

 circular orifice = 1 inches, and that of the pipe CEDF = 

 2 inches ? 



Here we have 



and therefore from the table c = 0.606, and from (5), 



___. 9 --056 



=S -- 



Hence, the whole head is 



* Since c comes between two numbers in the table, is found more accurately 

 from (5). 



