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00037_Field_37.txt
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1997-10-29
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736b
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21 lines
LIGHT BEAM CONTROLS
The height of the beam is controlled by
the knob near the top of the illumination
tower. The height of the beam is shown in
the small window above the height control
knob. The lever between the height control
and window is used to put neutral density
filters, cobalt and green filters in the light
beam.
The top portion of the light tower rotates
the light beam. The post that the height
adjustment knob is on can be grasped to
rotate this part of the tower. The amount
of rotation is noted on the scale at the
position of the metal rod below beam
height control. This is useful, for example,
in measuring the rotation of toric contact
lenses.