Hi Keith,
I gave a short presentation a few years ago on "Baubles, Bangles and Ring
Dials". It is only 6 slides, 330 kb but it has some useful information and
references. One reference is to Helmut Sonderegger's NASS Compendium article on
'Ring Dials, Farmers Ring" and his "Sonne" program that does ring dials. Here
is a link to my presentation on my Google Drive.
https://drive.google.com/open?id=0B14iMmxzLvJWZVpVOTctSk9meDQ
Enjoy,
Roger Bailey
Walking Shadow Designs
N 48.6, W 123.4
From: Keith E. Brandt, WD9GET
Sent: Thursday, June 15, 2017 10:37 AM
To: sundial@uni-koeln.de
Subject: Perforated ring dials
I received a gift of a perforated ring dial recently. Like most mass-produced
dials, it isn't set up for my latitude. I've tried to find info on these dials,
but I only see a section in "Sundials: Theory and Construction" talking about
ones with a fixed perforation. My Google-fu has failed me in locating info on
the construction of dials with movable perforations (like mine).
My goal is 2-fold: better general understanding of this type of dial, and
making alterations to correct this dial for other latitudes. (I do have a
preliminary correction based on the references I do have, but if I can roll in
the variable perforation location, I can make it more general.
Any good pointers?
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Keith E. Brandt, WD9GET
wd9...@amsat.org
'Christianity and science are opposed…but only in the same sense as my thumb
and forefinger are opposed - and between them I can grasp everything.' —Sir
William Bragg (Nobel Prize for Physics- 1915)
*This message transmitted with 100% recycled electrons
xb
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