What is the top central piece of a masonry arch called?

dollis1963, you would use a frame and remove it once the key stone is in place ive built a few

And the ones who oversees them are the keystone cops😂😂

Pennsylvania is also known as the Keystone State

I grew up in Manitoba, which is known as the Keystone Province in Canada.

dollis1963, I believe there is usually a wooden form or scaffold they build the arch over.

dollis1963, temporary supports

DSDA, I also grew up in Manitoba. It is known as the Keystone Province because it is shaped like a key.

Davy, Livingston, Lodestones are naturally magnetized pieces of the mineral magnetite. their importance to early navigation is indicated by the name lodestone, which in Middle English means "course stone" or "leading stone", from the now-obsolete meaning of lode as "journey, way".

I have keystone in my brick exterior of my home.

I thought it was called the Lodestone, so keystone makes perfect sense.