Forming a brick window arch over a barrel - GIF

Forming a brick window arch over a barrel.

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Previously:

Creating a twisted brick arch - video
Making a small wooden arch bridge - GIF
Removing temporary brick arch support - GIF

But how do they form the bottom arch?

Quote:

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Originally Posted by Ralphxyz

But how do they form the bottom arch?

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Gravity takes care of that.

Lots of reliance on the cement to fill the voids between bricks, I prefer keystone shaped bricks, or a much bigger rad and smaller voids.