| 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 |
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: |
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| 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 |
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| Source (print) |
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| Martin Gardner; illus. by Richard Edes Harrison
"Novel Map Projections" (Scientific American. 1975-11) p. 125 |
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| Source (online: page title &
link) |
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| This page: http://www.genekeyes.com/CAHILL_GALLERY/1975-Harrison.html |
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| Source (online: item link) |
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| This page: http://www.genekeyes.com/CAHILL_GALLERY/1975-Harrison-543x317px.jpg |
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