CAHILL OCTAHEDRAL WORLD MAP GALLERY

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B.J.S CAHILL'S BUTTERFLY MAP AND BEYOND: A COMPARATIVE GALLERY OF OCTAHEDRAL WORLD MAPS Compiled by Gene Keyes

Date	Author	This scale	<— Source	<— % change
[1914?]	B.J.S. Cahill	1/200 M	1/74 M	37%
Type	Aspect	Defining Meridian	Geocells	Original size
Curvilinear	N.America; Asia split	22 1/2°	15 x 10° & 7 1/2 x 10 °	406 x 558 mm
Remarks:
No date, but basic design and size resemble a 1914 version, "The Circumaviation 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.S. 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which has a much larger hand-made prototype of 1/12 M.) Waterman's is now the largest published Butterfly, 1/43 M; my unpublished wall draft is 1/20 M.
*Source (print)*
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" Item # 54 in Bancroft Library Cahill map collection index. See also my "Notes on Scaling Cahill and Cahill-Keyes Maps" as to why I impute a scale of 1/74 M, rather than ca. 1/83 M as stated by the index.
*Source (online: page title & link)*
This page: http://www.genekeyes.com/CAHILL_GALLERY/1914-Cahill-Denoyer.html
*Source (online: item link)*
This page: http://www.genekeyes.com/CAHILL_GALLERY/1914-Cahill-Denoyer.jpg

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2007-06-05; corrected 2009-03-09