Stumbled across a beautiful and unusual bridge, the only surviving example of its type in Chicago, erected in 1906.
Some info about the bridge itself www.historicbridges.org/illinois/cermak/index.htm
and
en.structurae.de/structures/data/photos.cfm?ID=s0003587
Some info about the bridge itself www.historicbridges.org/illinois/cermak/index.htm
and
en.structurae.de/structures/data/photos.cfm?ID=s0003587
Square Pegs
These seem to be some sort of counter-weight system
Exertion
a massive gear
Sanitary District of Chicago 1906
On Cermak
click to embiggen, and to juice my flickr stats
This is a structure I have never seen. The photos of the details are awesome.