Ring dial

[Jan Kulveit]

Dear gnomonists,

yesterday I have found a description of
kind of portable sundials knownn as "ring dials"
or "sun ring". The construction of dial with
one or two outlets is clear. But what about
a dial with a movavable segment with
an outlet? Did anyone know how constuct
this  dial? What was the advantage of
solution with movable segment?

Thanks.


Jan Kulveit 
tel/fax: +420-2-6882506
[EMAIL PROTECTED]       [EMAIL PROTECTED]