Making an Arc spectrum

 1. Put the narrowest slit (#1) in slit 2 (which leads F1 and F3).
    You only use slit #1 during set-up. For arc spectra to calibrate
    the observations you use the same slit as used for the stars.
 2. In the Coude room (one floor below the laser room): 
    make sure that the light from the ThAr lamp is reflected into
    the spectrograph. If not rotate the mirrors so that it will do.
    Use slit 2 position by rotation to "#5 Mirror (Sliver), slit #2)"
    If you want to beam the SKY (after opening the SKY cap) to
    F3 focus put the rotating plate on "Slit #2, Solar Mirror"
 3. Go to the laser room and turn the ThAr lamp on:
    * "turn the "COMPARISON LAMP SUPPLY" on
    * Voltage at 250 V
    * Current at 15 milli Amp
    * put the "STANDBY" switch on "ON"
 4. One panel below the "COMPARISON LAMP SUPPLY" is the control box
    for the mirrors.
    * put "LAMP STAGE" on "CS2". Light from the lamp will now be
      fed to spectrograph
    * put "GUIDER" on "SLIT" 
    * the "MASK A" and "MASK B" switch should be open.
 5. You're now set to integrate on an arc spectrum. Type in
    the iraf window "comp"

last update: Dec 22, 1996 by ejb