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If you should drop something down the tube onto the mirror cover
(which you were very careful to close before you got to a place where
you might drop something down there), you may reach in through the
access ports located in the square section of the tube about 5 feet
above the bottom and above the mirror cover (Fig. 26).
On rare occasions the mirror itself will frost over. DO NOT UNDER ANY
CIRCUMSTANCES TRY TO WIPE ANY MIRRORED SURFACE WITH ANYTHING. But you
may open the mirror cover and open all the access ports on the lower
portion of the telescope to encourage circulation and consequent
evaporation of the frost.
Use of a portable blower or a fan will speed the evaporation, but
avoid any drastic changes in mirror temperature. This is a rare
phenomenon you are not likely to encounter.
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Figure 26
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