| 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 |
| 1934 |
B.J.S. Cahill |
1/200 M |
1/400 M |
200% |
Type |
Aspect |
Defining Meridian |
Geocells |
Original size |
| Variant "E", Equal Area |
S. Atlantic |
22 1/2° |
15° & 7 1/2 x 15° |
40 x 100 mm |
| Remarks: |
||||
| Cahill scooped many of my ideas before I was
born: I thought at least I had devised the "M" layout in lieu of his usual Butterfly. Once again
he got there first: this from a draft set of 44 different arrangements
for what he called the "E" variant. Its octants are incised at the pole,
but joined at the Equator. This design came late in his life, and neither
the "E" nor the M supplanted his earlier versions. (Compare section 2 of his
3-in-1:that,
like most Cahills, including his 1920
M-shape, was incised at the equator.) |
||||
| Source (print) |
||||
| The above is from an unpublished draft at the
B.J.S. Cahill Collection, The Bancroft Library, Map Room, University of California,
Berkeley. A published version is in B.J.S. Cahill, "Static and Dynamic World
Maps", Bulletin American Meteorological Society. (1934-11) p. 261-265
(p.263), which is joined at the S. Pacific rather than S. Atlantic, but
my copy of the Bancroft draft was better than my Xerox of the article. Both
original illustrations were the same size. |
||||
| Source (online: page title &
link) |
||||
| This page: http://www.genekeyes.com/CAHILL_GALLERY/1934-Cahill-E.html |
||||
| Source (online: item link) |
||||
| This page: http://www.genekeyes.com/CAHILL_GALLERY/1934-Cahill-E.jpg |
||||
