  In the 70s of the last century, the stratospheric solar observatory "Saturn"
with a 100cm telescope was launched at Pulkovo Observatory. The photographs and
spectra obtained on it for more than 45 years remained record-breaking in
angular resolution. Then, for ground-based observations of Sun fine structure
in Pamir at an altitude of 4.5 km, a 50 cm open-type Pulkovo mobile telescope
was installed. Photographs and spectra obtained with the Saturn telescope for
the visible range were an important step in the development of high spatial
resolution technologies in heliophysics. However, to date, the details of these
studies remain unknown to the global scientific community. In this paper, an
attempt is made to partially fill this gap.
