How does one measure btw? Does that old weight tied to string thing work best?
Btw wouldn't successive road-work mean that buildings are out-of-whack because of that? Or maybe moved because of the ground beneath them shifting, ever so lightly?
I'm just joking around with E. here.
Yes, plumb bobs work fine and so did my tape measures, stick rule and levels. Yes, a lot of old buildings have settled over the years, some even to the point of having to be torn down. My house was built in the late 1920's. When I layed tile in the kitchen and hallway I found every wall was out. It took me half an hour of measuring so it would come out looking right. We do have a very unusual shaped kitchen.
New construction is much, much better but of course nothing is absolutely perfect. Watchmaking precision is not necessary and cost prohibitive.