Interior detailed view of the Old Retorts' Building. The steam engine.

Black and white digital copy. George Machairas Αrchive.

Overview of Gas Holder 2 (TDA Innovathens). The
photograph was taken while the building was inactive.

Black and white digital copy. George Machairas Αrchive.

Overview of Gas Holder 2 (TDA Innovathens). One can see the Gas Holder 3 in the background. It was built in 1904.

Colored digital copy. George Machairas Αrchive.

Interior detailed view of the Old Watergas. Wagon filled with coke.

Black and white digital copy from George Machairas’ archive.