Cahill butterfly conformal projection SW

Bernard Joseph Stanislaus Cahill (

London London is the capital and largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary down to the North Sea, and has been a majo ...

, January 30, 1866 -

Alameda County Alameda County ( ) is a List of counties in California, county located in the U.S. state of California. As of the 2020 United States Census, 2020 census, the population was 1,682,353, making it the 7th-most populous county in the state and List ...

, October 4, 1944), American

cartographer Cartography (; from grc, χάρτης , "papyrus, sheet of paper, map"; and , "write") is the study and practice of making and using maps. Combining science, aesthetics and technique, cartography builds on the premise that reality (or an im ...

and

architect An architect is a person who plans, designs and oversees the construction of buildings. To practice architecture means to provide services in connection with the design of buildings and the space within the site surrounding the buildings that h ...

, was the inventor of the octahedral "Butterfly Map" (published in 1909 and patented in 1913). An early proponent of the

San Francisco Civic Center The Civic Center in San Francisco, California, is an area located a few blocks north of the intersection of Market Street and Van Ness Avenue that contains many of the city's largest government and cultural institutions. It has two large plazas ( ...

, he also designed hotels, factories and mausoleums like the

Columbarium of San Francisco The San Francisco Columbarium & Funeral Home is a columbarium (repository for human ashes) owned and operated by Dignity Memorial, located at One Loraine Court, near Stanyan and Anza Streets, just north of Golden Gate Park in San Francisco, Cali ...

. His polyhedral Butterfly World Map, like

Buckminster Fuller Richard Buckminster Fuller (; July 12, 1895 – July 1, 1983) was an American architect, systems theorist, writer, designer, inventor, philosopher, and futurist. He styled his name as R. Buckminster Fuller in his writings, publishing more t ...

's later

Dymaxion map The Dymaxion map or Fuller map is a projection of a world map onto the surface of an icosahedron, which can be unfolded and flattened to two dimensions. The flat map is heavily interrupted in order to preserve shapes and sizes. The projection wa ...

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 Gene Scott Keyes (born October 24, 1941) is a former Assistant Professor of World Politics, a sometime peace activist, noted cartographer, and promoter of the international second language Esperanto. He achieved considerable attention for his peac ...

in 1975, the

Cahill–Keyes projection The Cahill–Keyes projection is a polyhedral compromise map projection first proposed by Gene Keyes in 1975. The projection is a refinement of an earlier 1909 projection by Bernard Cahill. The projection was designed to achieve a number o ...

References

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 CaliforniaPictorial materials from the Bernard Joseph Stanislaus Cahill papers

Bancroft Library The Bancroft Library in the center of the campus of the University of California, Berkeley, is the university's primary special-collections library. It was acquired from its founder, Hubert Howe Bancroft, in 1905, with the proviso that it retai ...

Bernard Joseph Stanislaus Cahill papers, (ca. 1900–1944)

Keyes, Gene, ''B.J.S. Cahill Butterfly Map Resource Page''
;By Cahill

(The Scottish Geographical Magazine, 1909–09) pp. 449–469 eproduced in 21 jpegsThe first publication and exposition of the Butterfly Map. *"Map of the World" (, 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:&mdash
"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. {{DEFAULTSORT:Cahill, Bernard J. S. 1866 births 1944 deaths American cartographers Map projections Architects from San Francisco

See also

References

External links