DESCRIPTION  AND  USE
308
To  rectify  then  the  terrestrial  globe,  is  to  bring
it  into  such  a  position,  as  that  the  enlightened
half  of  the  earth  s  surface  may  be  all  above  the
broad  paper  circle.
On  the  back  side  of  the  strong  brass  meridian,
and  on  each  fide  of  the  north  pole,  the  months
and  days  of  the  month,  are  graduated  in  two
concentric  spaces,  agreeable  to  the  declination  of
the  sun.
Bring  the  day  of  the  month  that  is  graduated,
on  the  back  side  of  the  strong  brass  meridian,  to
coincide  with  the  broad  paper  circle,  and  the
globe  is  rectified.
Thus  set  the  first  of  May  to  coincide  with  the
broad  paper  circle,  and  that  half  of  the  earth's
surface  which  is  enlightened  at  any  time  upon
that  day,  will  be  all  at  once  above  the  said  cirele.
If  the  horary  index  be  fet  to  XII  when  any
particular  place  is  brought  under  the  strong  brass
meridian,  it  will  ſhew  the  preciſe  time  of  sunrising ¬
  and  sun-setting  at  that  place.
It