Philadelphia's early-1800s wooden water pipes
washingtonpost.com
washingtonpost.com
So one morning, I saw someone walking toward me, wearing a stethoscope-like device, with a tube hanging down, almost touching the sidewalk. At first, I thought "crazy person, take care".
But then, I saw a "Philadelphia Water Department" logo. Basically, he was listening for leaks. His partner was one block away, and they talked via radio. So they could triangulate.
> sections of 10-foot pine logs
That was disappointing.
https://apps.npr.org/find-lead-pipes-in-your-home/en/#pipe-e...
https://www.phila.gov/water/wu/Water%20Quality%20Reports/201...
https://en.wikipedia.org/wiki/Fairmount_Water_Works
The bike path along the river goes right past it, and you can ride all the way to Valley Forge almost completely on a bike path free of motorized vehicles. (I am not paid by the city; I just like riding along rivers.)
Nice find though.
Oh ... and welcome to the 21st century.