The Frančula Projections

Tobias Jung


In the beginning of this year, I added the Györffy E projection to my website ( Preparing that blogpost, I read Györffy’s paper (Györffy 2018) where I stumbled across the mentioning of projections that “were created (…) by suitable renumbering of Aitoff and ordinary polyconic”. Now, I have written about the Umbeziffern (renumbering, quite a lot, but I had never heard or read that this procedure had been applied to the American Polyconic. So I investigated and found out that in 1971, Nedjeljko Frančula introduced a bunch of projections obtained by Umbeziffern from various parent projections (Frančula 1971).


map projections; Frančula

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