Hi Gianni,
Thanks for the information. My
Christmas wish list will include the reprint of Chris's commentary on John
Holywood's tracton Armillary Spheres, but 178 Euros is a high price and I
have difficulty reading Latin texts.I may have to be satisfied with
information on the web on this
Hi Dave,
Yes, we could rotate it every few days to adjust for all the time
differences. I was thinking more of evolving it so it wouldn't have to
move. ie. Something like the equatorial dial with analemmic style
does with the standard shadow dial. If anyone has ideas on evolving
the stab
Hi Roger,
thanks for the notes and the links.
If someone wants a more economic
Christmas[:-)] I suggest to
download some old texts of Clavius [Fabrica et usus instrumenti to
horologiorum descriptionem], Oronce Fine [De gli oriuoli et quadranti a sole]
and
You could certainly cut the longitudinal (hour) grooves in analemma
curves. Read the time by following the set of curves to the current date,
then read the time by which groove has sun showing at the bottom. (*)
Couple of problems, though. First, you would need two columns, swapped out
for the
Hello all,
I've uploaded a picture of a proof-of-concept design for a sundial to
http://hollands.sftt.co.uk/DialSite/barleysugardial.jpg.
It is immediately apparent that cartridge paper is the wrong material for
its construction! However, the essential idea should be clear - a helical
prism
I would like to throw in a note of caution. The lumps in the paper you found when you constructed the model may be unavoidable using flat material like paper or metal plate. There are certain shapes that are"developable"-- that can be fabricated by bending material in one direction. Other shapes,
