The mill is powered by water from the San Antonio River via an aqueduct built in 1734.
The photo was shot with a Yashica 635, w/80mm Yashinon, Polarizer (Minolta Autopole), tripod mounted, f-16, Kodak Portra 400VC.
I read the light from the floor using a Luna-Pro w/variable angle attachment @ 7.5 degrees.