"miscellaneous update"

git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@1265 9d0c8265-081b-0410-96cb-a4ca84ce46f8

1 files changed, 9 insertions, 8 deletions

diff --git a/ppmglobe.html b/ppmglobe.html
index 152a8b2b..a6474b3f 100644
--- a/ppmglobe.html
+++ b/ppmglobe.html
@@ -33,14 +33,15 @@ sphere.  Starting with a cylindrical projection, it produces an image
 you can cut up and glue onto a sphere to obtain the spherical image of
 which it is the cylindrical projection.
 
-<p>What is a cylindrical projection?  Imagine a map of the Earth on
-flat paper.  There are lots of different ways cartographers show the
-three dimensional information in such a two dimensional map.  The
-cylindrical projection is one.  You could make a cylindrical projection
-by putting a light inside a globe and wrapping a rectangular sheet of
-paper around the globe, touching the globe at the Equator.  Then trace
-the image that the light projects onto the paper.  Lay the paper out flat
-and you have a cylindrical projection.
+<p>What is a cylindrical projection?  Imagine a map of the Earth on flat
+paper.  There are lots of different ways cartographers show the three
+dimensional information in such a two dimensional map.  The cylindrical
+projection is one.  You could make a cylindrical projection by tracing as
+folows: wrap a rectangular sheet of paper around the globe, touching the globe
+at the Equator.  For each point of color on the globe, run a horizontal line
+from the axis of the globe through that point and out to the paper.  Mark the
+same color on the paper there.  Lay the paper out flat and you have a
+cylindrical projection.
 
 <p>Here's where <b>ppmglobe</b> comes in:  Pass the image on that paper
 through <b>ppmglobe</b> and what comes out the other side looks something