The  more  exact  equations,  35  and  36,  give  for  D  and  D^
D.- 2  X  375D  =  -2-^  [f5(7.15.-4.76«) +5^(7.15-4.76)]

or

D2  — 750  D-f  11,120  =  0


Digitized  by  LjOOQ IC


Governor  Specifications.  467


Solving  this  quadratic  equation  gives

D  -  750  —  V7bO'  —  4  X  11420


2

^       750  —  719       ..  .,    ,
D  = 5 =  15.5  feet


4800\     1  -

Db  =  15.5  +  c  X  4.76^  =  15.5  +  .176  X  4.76'  =  19.5  feet


«  =  ('+«T^)so=™


No  attempt  will  be  made 'to  estimate  the  greatest  drop  in  level
which  might  occur,  due  to  an  addition  of  waves.
231.  Governor  Specifications. — ^The  present  practice  of  requiring
the  governor  builder  to  guarantee  the  speed  regulation  of  a  plant,
in  the  design  of  which  he  has  had  no  voice,  without  even  giving
him  the  necessary  informatioai  regarding  the  hydraulic  elements
which  are  considered  in  this  chapter  is  wrong.  It  is  partly  the  out-
growth of  the  modem  tendency  to  specialize,  but  perhaps  more
largely  due  to  a  lack  of  understanding  on  the  part  of  the  engineer  of
the  nature  of  the  problem,  and  a  resulting  desire  to  shift  the  respon-
sibility for  results  upon  some  one  else  who  is  better  informed  upon
the  subject  and  thus  protect  results  financially  as  well  as  save  his
own  reputation  in  case  of  failure.
