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Screws must not be overtightened,
especially where aluminium thread, are involved.
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Optical surfaces, particularly grating surfaces, must not be
touched or contacted.
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OBSOLETE, uncorrected The exposure ,meter darkslide must be closed before removing the
case lid. As an added precaution the EHT should be switched off.
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OBSOLETE, uncorrected The shutter should be swung away from the slit by holding the
body of the mechanism not the shutter blade.
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When adjusting the camera mirror focus with the micrometer, ensure
that the clamp nut is released. For highest stability this nut should
be tightened once best focus has been determined.
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The grating rotation clamp must be released before the rotation
knob is adjusted.
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There is a possible fouling of the telescope pier by the collimator
tube at
declinations greater than +70 degrees when operating below
the pole.
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The grating should be protected by a cover during all operations
within the casing.
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Grating angles outside the range +60to -30
should not be set to avoid mechanical fouling between casing and
grating.
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NEEDS TO BE UPDATED When not in use, the field flattener should be protected by either
the plateholder or the dummy cover.
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When removing a corrector unit lift each clamp finger and swing to
the side of the cell and not to the rear where there is a danger of
contact with the rear optical surface.
manuals store
Tue Aug 5 00:46:52 BST 1997