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http://www.quadibloc.com/maps/mpol05.htm has a nice picture of a polyconic projection.

You choose a rectangle that is twice as wide as it is tall.

Divide the wide side into six sections.

Draw six arc sections that just touch in the middle.

Mark an extra edge on one side of the arcs so there will be some overlap to glue.

Cut out, remembering to leave the arcs connected as well as the tabs.

Even if you don't get the arcs perfect, you will end up with a quite nice ball!

This is how paper hot air balloon kits from the 1970s were assembled, so there shouldn't be any patent issues.

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16y ago

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