I've been thinking for some time about making dial on the model of
the "Tree of Sonius" in Limburg, Belgium (see Karl Schwarzinger's great
homepage: http://members.tirol.com/k.schwarzinger/b_5650.htm for a
picture of the dial and a very clear diagram illustrating the principle
of the dial. Thanks Karl!). Since my model will be for the southern
hemisphere, but is to be read 'left to right' it will have to be
'bowl-shaped' (or as I prefer to think of it, 'wineglass-shaped'!)
rather than 'umbrella-shaped' as is the Limburg original.
My question to the group is: what is the simplest, most sensible way
with a modest kit of hand/power tools to cut the complex shadow plane
slots for each hour?
My present thinking suggests i) drawing a normal vertical dial for
my location on the north face, then ii)'extending' the angle of the
style (from the 6 o'clock line) across the side of the block which
constitutes the dial and using the intersection of the style extension
with the south side of the block to position and draw a second vertical
dial--a mirror image, of course. Step iii) is to connect the respective
hour lines on the two faces across the edges. Step iv) would be to
successively align the block so that each hour plane is vertical and use
a mitre box to cut the shadow plane slots.
Since Fer de Vries co-designed the original, I'm sure he'll have a
far more sensible plan! (How on earth was it done in stainless steel??)
Many thanks,
Peter Mayer
--
Peter Mayer
Politics Department
Adelaide University, AUSTRALIA 5005
Ph : +61 8 8303 5606
Fax : +61 8 8303 3446
e-mail: [EMAIL PROTECTED]
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