Bernard J. S. Cahill

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Bernard Joseph Stanislaus Cahill (London, January 30, 1866 - Alameda County, October 4, 1944[1][2]), American cartographer and architect, was the inventor of the octahedral "Butterfly Map" (published in 1909 and patented in 1913[3]). An early proponent of the San Francisco Civic Center, he also designed hotels, factories and mausoleums like the Columbarium of San Francisco.

Cahill butterfly, conformal version of the projection. 15° graticule, 157°30′E central meridian.
From cover of 1919 pamphlet by Cahill, "The Butterfly Map", 8 p.

His Butterfly World Map, like Buckminster Fuller's later Dymaxion map of 1943 and 1954, enabled all continents to be uninterrupted, and with reasonable fidelity to a globe. Cahill demonstrated this principle by also inventing a rubber-ball globe which could be flattened under a pane of glass in the "butterfly" form, then return to its ball shape.

A variant was developed by Gene Keyes in 1975, the Cahill–Keyes projection.

See alsoEdit


  1. ^ "Cahill, B. J. S. (Bernard J. S.)". SNAC. Retrieved January 21, 2020.
  2. ^ "Bernard Joseph Stanislaus Cahill (Architect)". Pacific Coast Architecture Database. Retrieved January 21, 2020.
  3. ^ Polanco, Alejandro (July 12, 2011). "Un mapa del mundo para terminar con los mapas del mundo". Tecnología Obsoleta (in Spanish). Retrieved January 21, 2020.

External linksEdit

About Cahill
By Cahill