The Rounded End.

The Rounded End

The domed end of the tube helps create a nice cylindrical shape all the way down the tube.

Image by Don Garrison

Sourced from Monolithic Commons

Posted to Pushing the Limits: Airform Seam Strength and Concrete Culverts

CC BY-SA 4.0

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Image by Don Garrison from Monolithic Commons via Monolithic Dome Institute (CC BY-SA 4.0)