44
Turn the collector lens focusing knob to project the arc image on
the white paper placed on the stage. (A in the picture)
If the arc image is not projected, turn the burner centering knobs.
Turn the burner centering knobs to bring the arc image on the center
of the right (left) half of the field. (B in the picture)
Insert the Allen screwdriver in the mirror focusing screw on the rear
of the mercury lamp housing and turn it to bring the mirror arc image
e into focus. (C in the picture)
Turn the burner centering knobs to overlay the arc image with the
mirror arc image. (D in the picture)
During observation, turn and adjust the collector lens focusing
knob so that the brightness of the observation field becomes
uniform.
5
6
7
8
TIP
A
B
C
D
e
6
7
5
8
