Bernard J. S. Cahill, Oscar S. Adams (1929 approx.)
Group
Polyhedral
Property
Conformal
Other Names
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Remarks
In 1909, Cahill developed his first (compromise) butterfly map. He succeeded in having Oscar S. Adams develop the mathematics for a conformal version, which he published in 1929.
In Cahill’s original arrangement, Africa was placed in the upper left lobe, the map shown here was centered on 20° West.
Specified in [square brackets]: Actual size of the projection
(minus the black or white background). When marked with [≈], sizes with and without
background are approx. the same.
