The Doridis telescope

 
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.

Atlas von Athen

(Source: Curtius and Kaupert 1878, Bl. VI)