Hello Roger,
You wrote :
My suggestion to calculate the hour lines is to treat the cylinder like a
polygon with a series of flat vertical faces. Calculate the lines for each
face the usual way as a series of vertical declining dials. Lay out the
design for each facet and draw a smooth curve
Excellent! We now have two elegant solutions proposed: Tony Moss's
orthographic projection and Fear de Varies's mathematics. I need to study
both to understand and use them.
Tony, your sketch is worth 10,000 words. I see from the sketch how things
are laid out and points projected to different
Roger Bailey contributed:
SNIP
Tony, your sketch is worth 10,000 words. I see from the sketch how things
are laid out and points projected to different planes. But I am having some
trouble with the words as you seem to be starting at the solution (P1) and
working back to find the location of
At 07:29 PM 3/1/00 +0100, Alain MORY wrote:
Hi, all diallists !
I'm asked to realise a vertical sundial on a circular tower. I don't
know exactly (it's a truism !) how to proceed.
This sundial will probably be built on stone, but we can't curve the
stone. Then I think that it will be possible to
]; Alexei Pace [EMAIL PROTECTED]
Cc: sundial@rrz.uni-koeln.de
Sent: Saturday, March 04, 2000 9:14 AM
Subject: Re: Cylindrical Dial
At 07:29 PM 3/1/00 +0100, Alain MORY wrote:
Hi, all diallists !
I'm asked to realise a vertical sundial on a circular tower. I don't
know exactly (it's a truism
