TM 10-3610-202-14 CAUTION To avoid mercury vapor lamp failure, white   gloves   should   be   worn   when handling    the    glass    portion    of    the tube, to prevent transfer of fingerprints to the glass, and subsequent decrease of lamp efficiency. b. Light  Table.    The  light  table  is  a  Foster  Model  36 G/S and is used to prepare copy from which the lithographic printing plates are made.  The preparation includes layout of the  copy  and  retouching,  opaquing,  masking  and  stripping. The unit is shock mounted to a shelf attached to the left-hand shelter wall.  A rotating type stool is provided for the operator and is secured when not in use immediately below the shelf. The    electric    power    cord    of    the    unit    is    inserted    into    a convenient  wall  receptacle  above  the  shelf.    A  two  position toggle  switch  installed  on  the  front  of  the  light  table  controls illumination of the fluorescent tubes within the unit. c. Composing Machine.  The type composing machine is a Varityper Model 1010F and is used in the preparation of master copy for reproduction.  The composer which is a cold type direct impression machine incorporates power control of the keyboard, carriage return and paper advance. Interchangeable  type  faces  provide  a  variety  of  point  sizes with  a  differential  spacing  capability  automatically  selecting correct letter design width.  Right-hand margin justification is achieved  automatically  through  the  use  of  margin  stops  for the desired column width.  A forms ruling device provides for ruling  of  any  style  of  line  or  leader.    The  composer  is  shock mounted to a stand attached to the front wall of the shelter.  A folding chair is provided for  the  operator  and  is  secured  when  not  in  use  to  the  left- hand shelter wall adjacent to the light table shelf.  The electric power   cord   of   the   unit   is   inserted   into   a   convenient   wall receptacle immediately below the wall cabinet. d. Camera.  The camera is a Goodkin vertical process 18  inch  unit  equipped  with  an  8.25  inch  focal  length  wide- angle   color   corrected   lens.      Recalibration   of   the   lens   is accomplished  by  adjustment  of  the  calibration  tapes  for  the lens  and  copyboard.    Two  vacuum  pumps  are  provided  with the  camera.    (See  fig.    2-2.)  The  pump  to  the  right  of  the camera, controlled by a foot pedal, is connected by means of a  flexible  hose  to  the  underside  of  the  copyboard.    During operation this pump provides the vacuum for even contact for the  material  to  be  re  produced.    The  pump  to  the  left  of  the camera, controlled by the camera power switch, is connected by  means  of  a  flexible  hose  to  the  film  case  and  provides vacuum for even contact of the film during exposure.  Camera lighting  is  supplied  by  four  650  watt  quartz  lamps  located  in two   housings,   bracket   mounted,   one   on   each   side   of   the copyboard  base.    A  one-piece  conical  bellows  serves  as  a light-tight   seal   between   the   lens   case   and   the   film   case. Camera   controls   and   timer   are   located   in   a   control   panel installed   on   top   of   the   equipment.      The   camera   lens   is removed   and   placed   on   a   bracket   in   the   inverted   position during camera moving. CAUTION Never   leave   lens   bellows   extended when    the    camera    is    not    in    use. Retract   bellows   so   as   to   maintain folds in correct position. 2-3