Bernard J. S. Cahill

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 also

• World map
• Waterman butterfly projection
• Octants projection
• Cahill–Keyes projection

References

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 links

About Cahill

• Parry, David, "Architects' Profiles: Pacific Heights Architects #30 – Bernard J. S. Cahill". Includes photograph of Cahill.
• Bernard J. S. Cahill Collection, ca. 1889–1938 (Environmental Design Archives. College of Environmental Design. University of California, Berkeley. Berkeley, California)
• Finding Aid at the Online Archive of California
• Pictorial materials from the Bernard Joseph Stanislaus Cahill papers, Bancroft Library
• Bernard Joseph Stanislaus Cahill papers, (ca. 1900–1944), Bancroft Library
• Keyes, Gene, B.J.S. Cahill Butterfly Map Resource Page

By Cahill

• "An Account of a New Land Map of the World" (The Scottish Geographical Magazine, 1909–09) pp. 449–469 [reproduced in 21 jpegs] The first publication and exposition of the Butterfly Map.
• "Map of the World" (U.S. Patent 1,054,276, 1913) Washington, DC: United States Patent Office, 1913-02-25; filed 1912-03-05
• "Geographic Globe" (US Patent 1081207, 1913: rubber-ball globe which can flatten to a Butterfly Map, or return to ball shape.)
• "Projections for World Maps" (1929) —continued in separate pdf:— "A New Map for Meteorologists: Equally Suitable for Small Areas, Continents, Hemispheres or the Entire World" – both from Monthly Weather Review, 57/4, 1929–04) pp. 128–133; illus.
• "One Base Map in Place of Five" (1940) Monthly Weather Review, 68/2, 1940–02, p. 4; 1 illus.