The large refracting telescope of the National Observatory of Athens is manufactured by the French house Gautier, financed by donations of Greeks of the Diaspora; it is installed under a special vault, a few metres away from the bema of the Pnyx. The telescope is available to this day for night sky observation of the planets and celestial phenomena.
Selected bibliography:
Zerefos et. al. 2013, 79; Visitor Center in Thissio.