NPZ TAL-1, Руководство по обслуживанию

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6.3. Telescope and atmospheric conditions
At great magnifications together with the increase of the visible
dimensions of the object the disturbances due to atmosphere are
increased. It is expressed in great blurring of the images of the distant
objects, in scintillation of the star images.
The observations in the cold seasons are possible when all tele-
scope parts acquire the ambient temperature. For air circulation inside
the telescope tube there is a hole plugged with a stopper in the cell of
the primary mirror. In operation the stopper should be unscrewed from
the cell.
But in observations the great disturbance of atmosphere may take
place at nights, that leads to bad images of the celestial objects. It is
quite possible that at those nights the observations of the fine details of
the planets and of the Moon are unsuccessful.