^^^
Rusty Staub and Ducov
Here's a photograph of one of the tanks you guys mentioned, taken in 1929.
...and this is the reverse of the photo.
You guys should check out the thread I started under
buildings and architecture:
"ROOFTOP TRANSMISSION TOWERS and obsolete BEACONS."
I think its cool that you noticed such a small detail (the tanks)
in that 1938 aerial shot.