screen without having to move either the projec- tor or the screen. REMOTE   CONTROL.—A   remote   control unit  is  furnished  with  the  projector.  It  consists of a remote control cord that plugs into the con- trol  receptacle  at  the  back  of  the  projector (figure  7-12).  The  12-foot  (3.7-m)  remote  con- trol  cord  permits  you  to  change  slides  with  the simple  push  of  a  button.  Forward  and  reverse selector buttons allow you to advance or reverse the slide tray. To advance the slide tray, depress the  forward  (FWD)  button;  to  reverse  the  slide tray, depress the reverse (REV) button, One  or  more  25-foot  (7.6-m)  cords  can  be added  to  the  12-foot  (3.7-m)  remote  control cord.  The  focusing  lever  permits  movement  for away-from-the-projector     focusing. PREPARATION.—Place   the   projector, bottom side up, on a sturdy table, bench, or pro- jection   stand.   Slide   the   storage   compartment door  latch  in  the  direction  of  the  arrow  marked “OPEN”  and  raise  the  door.  A  three-wire, grounded,  power  cord  is  permanently  attached to  the  projector.  Remove  the  full  length  of  the power cord. If a quantity of the cord is left in the compartment,  it  may  interfere  with  the  ventila- tion  of  the  motor.  Lay  the  power  cord  in  the notch   at   the   corner   of   the   compartment   and close  the  compartment  door.  Turn  the  projector upright. The  three-wire  power  cord  and  three-prong polarized plug are for direct connection to a 110- to  125-volt,  60-Hz,  a.c.  electrical  outlet  of  the grounding type. By using a power cord adapter, it  is  possible  to  plug  the  projector  into  any  con- ventional  receptacle.  However,  when  this  is done, the grounding wire on the adapter should be  connected  to  a  suitable  ground.  In  locations where  the  projector  will  be  used  frequently,  the usual  two-prong  receptacle  should  be  replaced with  a  three-prong  polarized  receptacle  that  is properly  grounded. Position  the  carrying  handle  as  far  up  as  it will go, so that it will not interfere with access to the   elevation   wheel.   Plug   the   remote   control cord  into  the  remote  control  receptacle  at  the back  of  the  projector. SCREEN  AND  SEATS.—Since  most  slides are  horizontal,  it  is  most  convenient  to  use  a square  screen.  The  screen  should  be  large  for easy  viewing.  Position  the  screen  at  the  same level  as  (or  higher  than)  the  projector. LOADING  THE  SLIDE  TRAY.—Check  to be sure that the lock on the bottom of the tray is engaged in the notch in the metal slide retainer. If   it   is   not,   turn   the   retainer   until   the   lock engages  the  notch.  Remove  the  locking  ring from  the  top  of  the  tray.  Invert  each  slide  and place  one  in  each  open  slot  so  that  the  printed border  or  trademark  side  of  cardboard-mounted slides (or the emulsion side of a glass, metal, or plastic-mounted   slide)   face   toward   the   next lower number on the slide tray. For example, the emulsion   side   of   slide   number   2   should   face toward  slide  number  1  and  so  on.  After  loading the  slide  tray,  replace  the  locking  ring,  turning it   in   the   direction   of   the   arrow   marked “LOCKED”  until  the  detented  action  can  be felt at least once or twice and the ring is secure on the tray. S E A T I N G    T H E    L O A D E D    S L I D E TRAY.—Place  the  loaded  slide  tray  on  the  pro- jector  so  that  the  hole  in  the  center  of  the  tray fits over the center post on the top of the projec- tor. Then, revolve the slide tray slowly until the identification  number  “0”  is  opposite  the  gate index  on  the  projector  (figure  7-12).  After pushing  the  tray  down  into  the  operating  posi- tion  on  top  of  the  projector,  check  to  be  sure that  the  lock  on  the  bottom  of  the  tray  is engaged in the notch in the metal slide retainer. If  it  is  not  engaged,  turn  the  retainer  until  it engages. OPERATION.—When   you   have   placed   the projector  on  a  sturdy  table,  properly  plugged  in the  power  cord,  positioned  the  screen  and chairs,  inserted  the  slides  into  the  tray,  and seated the tray, you are ready to begin the opera- tion  of  the  projector. Projection   Lamp.—After   setting   the automatic timer to the M (manual) position, you can  turn  on  the  projection  lamp  by  sliding  the select  or  switch  to  either  the  LOW  or  HIGH position.  Momentarily  depress  the  FORWARD 7-23