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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[1914?]
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B.J.S. Cahill
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1/200 M
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1/74 M
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37%
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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
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N.America; Asia split
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22 1/2°
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15° &
7 1/2 x 15°
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406 x 558 cm
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Remarks:
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No date, but basic design and size resemble a 1914 version, "The
Circumnavigation of the Globe Under the Auspices of the Panama-Pacific Universal
Exposition 1915". (Where Cahill was awarded a gold medal for the map; but
the trans-global air race was put off till 1922 . . . ) So far as I know,
this was the largest* published version of Cahill's map, 16 x 22"; unfortunately,
its Asia-split layout is by far the least desirable of various Butterfly
and M-shaped arrangements.
*Cahill and the C.W. Hammond Co. made an Agreement
in 1924 to publish a 1/28 M map, but by 1926 Hammond had backed out. (Papers
in Cahill Collection [below], which has a much larger hand-made prototype
of 1/12 M.) Waterman's
is now the largest published Butterfly, 1/43 M; my unpublished wall draft
is 1/20 M.
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Source (print)
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Chicago: Denoyer-Geppert Co., Cartocraft Desk Outline Map, World,
No. 15098. (B.J.S. Cahilll Collection, Bancroft Library, Map Room, University
of California, Berkeley) Captions read:
"Cahill's Octahedral System of World Map Projection"
"Equivalent to the scale of a six inch globe"
"The Butterfly World Map shows the surface of the globe as fairly correct
in Scale, Shape, and Area"
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Source (online: page title & link)
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This page:
http://www.genekeyes.com/CAHILL_GALLERY/1914-Cahill-Denoyer.html
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Source (online: item link)
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This page:
http://www.genekeyes.com/CAHILL_GALLERY/1914-Cahill-Denoyer.jpg
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