I'd just like to say a few more things about the portable folded-paper
flat-dials. What interests me about them is that I like the Regiomontanus,
as my favorite portable dial, and the most easily-built sundial of any
category. But it's of interest how easily-built can be a portable-dial that
I'd like to correct a few errors I've made, and make a few more comments.
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Just as the cross-section of a Cyindrical-Equatorial Dial is a half-circle,
the ideal cross-section of a Box-Polar Dial or the Horizontal/Polar
combination that I proposed, would be a half-square.
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So
I should add that the Folded-Paper Horizontal & Vertical-Polar Dial can
also be made with just one fold:
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A 2:1 paper rectanble is folded at its middle in a right-angle.
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The fold is held by a thread connecting the middles of the top-edges of the
two squares.
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A nodus (bead or
Some Portable Folded-Paper Flat-Dials
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Paper flat-dials with one or two right-angle folds are easily-built and
easily-carried. Some wouldn't be very difficult to use.
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First let me comment on one or two other portable dials:
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The Regiomontanus card altitude-dial is surely the most easily-built
