B.J.S CAHILL'S BUTTERFLY MAP AND
BEYOND:
A COMPARATIVE GALLERY OF OCTAHEDRAL WORLD
MAPS
Compiled by Gene Keyes
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Date
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Author
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This scale
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<— Source
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<— % change
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1913
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B.J.S. Cahill
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1/200 M
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1/263 M *
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131.5 %
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Type
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Aspect
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Defining
Meridian
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Geocells
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Original size
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Curvilinear
(rubber ball) |
N.Pacific
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22 1/2° W
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22 1/2°
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190 x 340 mm
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Remarks:
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Cahill's rubber ball map, which he patented in 1913. Global
data is painted on the ball, which is then partially cut at the proper meridians.
When pressed under a pane of glass, it becomes a Butterfly Map; upon release,
it springs back to ball-globe shape, proving the close relation between the
continents as shown on the Butterfly vis-a-vis the globe. The original artifact
is at the Bancroft Library's Cahill collection, University of California,
Berkeley. (The patent's illustrations are a sketch, not like the better photo
above.)
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Source (print)
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Several arrangements of this illustration appear in various
Cahill articles and brochures, e.g., in his definitive pamphlet An Account
of a Land Map of the World on a New and Original Projection Invented by B.J.S.
Cahill A.I.A., F.R.G.S (reprinted from the Journal of the Association
of Engineering Societies, 1913-10) p. 153-207 [p.201]; originally read
before the Technical Society of the Pacific Coast, 1912-10-11.
Because my Xeroxes of those are too faint, I have made a new composite from
a better Xerox of the original illustrations, which had been removed to a
[1939] manuscript "The Butterfly Map of the World Today" at the Bancroft
Library.
*The illustration itself was a reduction: the ball being 6" in diameter,
therefore a scale of ca. 1/167 M.
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Source (online: page title & link)
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This page
http://www.genekeyes.com/CAHILL_GALLERY/1913-Cahill-rubber-ball.html
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Source (online: item link)
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This page
http://www.genekeyes.com/CAHILL_GALLERY/1913-Cahill-rubber-ball.jpg
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