How to curve a two by four

To the left is a closeup of the first curved wall. The curved two by four was made up of two one by fours that have been slotted so we could bend them. The picture above is of the jig we used to create the curved beams. The slotted one by fours were glued together and sometimes also screwed together. The curved walls were anchored to the dome wall and to the floor with concrete anchors.