This looks like a slip form to me, with the added radius connection for forming domes. I used a similar scheme when I did a tire dome, a measurement attached to the center of the sphere and used to place each tire. For years I dreamed of using a commercial curb machine, like is used to make the curbs along streets, but tethered to a dome center instead of guided along a straight line.
Look at this igloo making tool that uses snow.....I wonder if a person could adapt such an idea for placing papercrete block by block?
http://www.grandshelters.com/index.html
Jackie
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