Reinhardt's  method  of  governing  does  not  come  strictly  under
any  of  the  heads  so  far  discussed.  The  inlet  valve  is  shown  in
Fig.  14-25.*  The  valve  opens  and  closes  with  the  beginning  and
end  of  the  suction  stroke.  Above  the  valve  there  are  arranged
a  series  of  ports,  I  for  gas  and  II  and  III  for  air.     The  flow  of  gas


Fig.  14-25.
or  air  from  these  ports  into  the  valve  chamber  proper  is  controlled
by  a  slide  guided  by  the  valve  spindle.  At  the  beginning  of  the
suction  stroke  the  slide  only  frees  the  ports  from  chamber  III,
and  hence  only  air  is  admitted.  At  some  point  in  the  stroke,  how-
ever, as  determined  by  the  governor,  the  slide  is  suddenly  released
and  forced  down  by  springs.  This  closes  ports  III  and  opens  gas
ports  I  and  air  ports  II.  .Mixture  of  the  proper  proportion  then
*  Reinhardt,  Bi-monthly  Bulletin,  Am.  Inst.  Mining  Engs.,  Nov.,  1906.
REdULATION    OF    (!AS    ENdlNKH


465


enters  the  cylinder  until  the  end  of  the  suction  stroke.  As  far  as
the  admission  of  a  varying  quantity  of  constant  mixture  is  con-
cerned, this  system  is  pure  quantity  regulation;  but  since  the
amount  of  air  drawn  from  III  increases  as  the  load  decreases,  the
mixture  in  the  ejdinder  as  a  whole  grows  leaner  as  the  load  drops.
It  is  claimed,  however,  that  combustion  is  good  even  under  fric-
tion load,  because  although  the  amount  of  constant  mixture  drawn
in  is  small,  more  or  less  stratification  of  the  charge  ensures  the
presence  of  a  fairly  rich  mixture  around  the  igniter.  The  system
has  the  advantage  over  pure  quantity  regulation  in  that  the  com-
])ression  pressure  remains  practically  unchanged.
