floor set now debating thickness

[Balty Knowles]

Re Maver's parabolic arch description. Here's me thinking I'd figured out something all by myself Anyway check out the thumbnails, I did exactly that for a gate into the Pizza Piazza Hope it illustrates the principal

[DaveHI]

catenary arches date back to the Romans, but give yourself so credit anyway.

As for Jame's "skrew" course. I plan to just nip the corners off my soldier course brick (full brick). Anybody think that's off base?