Siderostat, an astronomical instrument consisting of a flat mirror which is turned gradually by a motor for transmitting a beam of light along the optical axis of a fixed horizontal telescope, vintage line drawing or engraving illustration. Poster #395684056
Siderostat, an astronomical instrument consisting of a flat mirror which is turned gradually by a motor for transmitting a beam of light along the optical axis of a fixed horizontal telescope, vintage line drawing or engraving illustration. Poster #395684056
