Philip Poburka on thu 30 jan 03
verses a Parabola
What a good idea! - to make the Cones of Clay and cut
However, I think the Hyperbola is 90 degrees to the plane of
the base...whilst the Parabola is some angle other than
90...without it mattters much what the angle of the sides
are of the Cone in question.
So the larger the ratio of height to width of base, the more
nearly acute the Hyperbola would be...the smaller that
ratio, the more obtuse...
----- Original Message -----
From: "Michael McDowell"
Sent: Wednesday, January 29, 2003 11:00 PM
Subject: Hyperbolic Bowls
What about doing it in three dimensions out of clay? You
some small cones with different angles for the sides easily
out of clay on the wheel. Then you could slice them when
leather hard and get a pretty good conic section. My
that a hyperbolic curve results from slicing at a greater
the sides make with the base. Nothing hard about that.
Paul's suggestion, get it right at any size and then blow it
a copy machine.
Whatcom County, WA
Send postings to email@example.com
You may look at the archives for the list or change your
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at