Bill,
I've wondered about the same. Edley seems to be having some wonderful
conversations with himself ;)
Luke
[EMAIL PROTECTED] wrote:
>
> Is there something wrong with the list? It seems that Edley is responding to
> a message about a Dodwell dial, but I never received it.
>
> Bill Gottesman
> Burlington, VT
>
> In a message dated 12/19/2001 4:41:11 AM Eastern Standard Time,
> [EMAIL PROTECTED] writes:
>
> >
> > Date: 12/19/2001 4:41:11 AM Eastern Standard Time
> > From: [EMAIL PROTECTED] (Edley)
> > Sender: [EMAIL PROTECTED]
> > To: [EMAIL PROTECTED] (Peter Mayer)
> > CC: [email protected]
> >
> > Hello Peter,
> >
> > Wow, The Dodwell dial is amazing! I wish I had some better pictures
> > so that I could see it in some more detail. The surfaces appear to
> > be of the "Astroid/Evolute of an Ellipse" type. I assume the
> > "unwinding of the analemma" is by multiple gnomons? This has given
> > me an idea for a different kind of polar dial that covers all the
> > hours. I've got to think about this one. I too am at a loss as to
> > how he made it in the 1940's! There were some cam fed machining
> > tools that could have done the basic curves of the design, but laying
> > out the actual hour lines must have taken a long time.
> >
> > Thanks much!,
> >
> > Edley McKnight
> >
