Go back to Cahill Gallery Thumb Index
Go back to B.J.S. Cahill resource page
Go back to Gene Keyes home page

B.J.S CAHILL'S BUTTERFLY MAP AND BEYOND:
A COMPARATIVE GALLERY OF OCTAHEDRAL WORLD MAPS
Compiled by Gene Keyes
  1975 Harrison
Date
Author
This scale
<— Source
<— % change
1975
Richard Edes Harrison
1/200 M
1/222 M
111%

Type

Aspect

Defining
Meridian


Geocells


Original size
Gnomonic
N.Atlantic
30°
10°
105 x 180 mm
Remarks:
While Richard Edes Harrison usually did splendid mapwork, this one was a dud: another disservice to Cahill. 1) It split on the wrong meridian, 30° W rather than 20° W, thereby slicing Australia; 2) the graticule is almost freehand, crude and assymetrical within the triangles (compare the E. and W corner. equatorial geocells); 3) the gnomonic variant is not the best general purpose Cahill map, because it cannot assemble the polar regions
Source (print)
Martin Gardner; illus. by Richard Edes Harrison "Novel Map Projections" (Scientific American. 1975-11) p. 125
Source (online: page title & link)
This page:
http://www.genekeyes.com/CAHILL_GALLERY/1975-Harrison.html
Source (online: item link)
This page:
http://www.genekeyes.com/CAHILL_GALLERY/1975-Harrison-543x317px.jpg

Go back to Cahill Gallery Thumb Index
Go back to B.J.S. Cahill resource page
Go back to Gene Keyes home page

2007-06-05