On Fri, 25 Aug 2006 15:43:37 +0100 Mike Barnes wrote :
Surely a line can be perfectly straight or perfectly horizontal, but not
both. Except for a zero-length line, of course.

Ah yes. On a tour we went to see the longest pier in Queensland, used for
loading sugar. Constant height above the water and, we were told, the
middle is six foot above a straight line joining the ends.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk