I can't find an image on the internet, of a Circumference-Aperture
Cylinder-Equatorial dial, but I'm going to post a drawing of one.
By the way, I use a broad definition of Equatorial Dial. Instead of only
dials with a dial-face parallel to the equator, I include all dials that
directly measure th
during the
a.m. hours, or the number of hours from 6 p.m., during the p.m. hours."
...which could also be said as: " 15 degrees times (6 minus the number of
hours from 12 noon)".
...for the hours from 6 a.m. to 6 p.m.
Michael Ossipoff
On Mon, Oct 23, 2017 at 7:31 PM, Michael Ossipo
gt; *Sent: *Tuesday, October 24, 2017 1:32 AM
> *To: *Brad Thayer
> *Cc: *sundial list
> *Subject: *Re: Hemicyclium correction
>
>
>
>
>
> In the Hemicyclium discussion, the OP mentioned having 6-inch copper
> tubing. So, though it was a bit off-topic, I suggested that the
hem more clear to a
> general public. Could you please support your ideas with a figure or a link
> to an external one (if exists)?
>
>
>
> Best regards,
>
> Wojtek
>
>
>
> *From: *Michael Ossipoff
> *Sent: *Tuesday, October 24, 2017 1:32 AM
> *To: *Bra
>
> Best regards,
>
> Wojtek
>
>
>
> *From: *Michael Ossipoff
> *Sent: *Tuesday, October 24, 2017 1:32 AM
> *To: *Brad Thayer
> *Cc: *sundial list
> *Subject: *Re: Hemicyclium correction
>
>
>
>
>
> In the Hemicyclium discussion, the OP mentioned h
, 2017 1:32 AM
To: Brad Thayer
Cc: sundial list
Subject: Re: Hemicyclium correction
In the Hemicyclium discussion, the OP mentioned having 6-inch copper tubing.
So, though it was a bit off-topic, I suggested that the tubing could be used
for an additional, quicker, project, to make a south
In the Hemicyclium discussion, the OP mentioned having 6-inch copper
tubing. So, though it was a bit off-topic, I suggested that the tubing
could be used for an additional, quicker, project, to make a south
windowsill sundial--a Circumference-Aprerture Cylindrical Equatorial Dial.
But, when I
I find the video below extremely instructive!
https://youtu.be/0hs6QqwJIhs
The sundial is marked in old temporary (or seasonal) hours. Changing them
to modern hours does not make much sense to me.
For it to become a hemicyclium I guess you just have to leave out the
unused part of the half
> *From:* Patrick Powers
> *Sent:* Sunday, October 22, 2017 12:40 PM
> *To:* Brad Thayer ; sundial@uni-koeln.de
> *Subject:* Re: Hemicyclium correction
>
> Hi Brad
>
> Further to your interest in an hemicyclium you might like to know of this
> link to the former webpage
today. My sincere apologies
to Frans!
Patrick
From: Patrick Powers
Sent: Sunday, October 22, 2017 12:40 PM
To: Brad Thayer ; sundial@uni-koeln.de
Subject: Re: Hemicyclium correction
Hi Brad
Further to your interest in an hemicyclium you might like to know of this link
to the former webpages
Hi Brad
Further to your interest in an hemicyclium you might like to know of this link
to the former webpages of the late Frans Maes who set out his instructions for
“Construction of Hemispherium” some time ago and which is based on several
earlier documents – all referenced. You might find
g/sinking and chasing metal forming class, I was interested in making
>> a bowl with chased lines (aka, repousse) for practice, hence the idea for
>> the hemicyclium.
>>
>>
>>
>> I lucked into some used 14 gauge copper tubing about 6 inches in
>> diameter, w
ines (aka, repousse) for practice, hence the idea for
> the hemicyclium.
>
>
>
> I lucked into some used 14 gauge copper tubing about 6 inches in diameter,
> which I annealed, cut open and pounded flat as a starting point. So I have
> the basic starting materials.
>
>
>
>
Brad--
I don't know if this is of interest or not, because I realize that the
Hemicyclium is your main project.
If you have any of that 6-inch diameter copper tubing left, then why not
cut off a section of it, with width equal to half the diameter, for an
additional project that can be comp
dd...
>
> > And if I do tilt the hemispherium
> > so that the horizon line is now
> > instead parallel to the earth's
> > axis, does that solve any of the
> > issues?
>
> This is like taking an aircraft as
> your inspiration for designing a
> car a
pherium
> so that the horizon line is now
> instead parallel to the earth's
> axis, does that solve any of the
> issues?
This is like taking an aircraft as
your inspiration for designing a
car and not appreciating what the
wings are for.
The absolutely key feature of the
hemicycli
Brad--
>
> If the inside surface is marked with the lines analogous to lines of
> longitude on a globe spaced 15 degrees apart, radiating from the “pole” of
> the hemicyclium, and the entire device is tilted to align with the earth’s
> axis, would it then read out in Local
,
repousse) for practice, hence the idea for the hemicyclium.
I lucked into some used 14 gauge copper tubing about 6 inches in diameter,
which I annealed, cut open and pounded flat as a starting point. So I have the
basic starting materials.
If the inside surface is marked with the lines
instead
parallel to the earth's axis, does that solve any of the issues?
-Original Message-
From: Frank King [mailto:f...@cl.cam.ac.uk]
Sent: Monday, October 16, 2017 11:12 AM
To: Brad Thayer
Cc: sundial@uni-koeln.de; Frank King
Subject: Re: Hemicyclium correction
Dear Brad,
You say:
a two-sided Disk-Equatorial is incomparably easier to construct
>> than a Band-Equatorial or Cylinder-Equatorial. ...if you don't mind the
>> fact that a Disk-Equatorial can only be read from the north in the summer,
>> and from the south in the winter.
>>
>> Mi
orth in the summer,
and from the south in the winter.
Michael Ossipoff
On Mon, Oct 16, 2017 at 8:48 AM, Brad Thayer
wrote:
> I am looking to make a hemicyclium-type sundial (half-hemisphere) in a
> metal working class. What little I can find on them says they are
> inaccurate, without
On Mon, Oct 16, 2017 at 8:48 AM, Brad Thayer
wrote:
> I am looking to make a hemicyclium-type sundial (half-hemisphere) in a
> metal working class. What little I can find on them says they are
> inaccurate, without being very clear on the problem.
>
But the way, I'v
Dear Brad,
You say:
> I am looking to make a
> hemicyclium-type sundial
> (half-hemisphere) in a
> metal working class.
> Am I missing anything?
Er, yes. Rather a lot alas...
Before you start bashing metal
it may be worth spending rather
less effort on a prototype.
I am looking to make a hemicyclium-type sundial (half-hemisphere) in a metal
working class. What little I can find on them says they are inaccurate,
without being very clear on the problem. It appears to me the only issue is
it needs to be tilted so that the gnomon aligns with the Earth&#
http://www.collsemolen.dse.nl
Eindhoven, Netherlands
lat. 51:30 N long. 5:30 E
- Original Message -
From: Phil Walker
To: sund...@rrz.uni-koeln.de
Sent: Tuesday, October 26, 2010 6:48 PM
Subject: Hemicyclium dials
Hi diallers,
I am considering a model cube dial with E. S and W
long. 5:30 E
- Original Message -
From: Phil Walker
To: sund...@rrz.uni-koeln.de
Sent: Tuesday, October 26, 2010 6:48 PM
Subject: Hemicyclium dials
Hi diallers,
I am considering a model cube dial with E. S and W faces, each with a
concave hemisphere on it. It
e a pin gnomon with a ball nodus
at
> the end, at the centre of the hemisphere. I understand that this is
based
> in the Greek" hemicyclium" but there.are a few 16th century cube dials
of
> this type in England and Scotland.
> I've two questions,
> What are th
Hi diallers,
I am considering a model cube dial with E. S and W faces, each with a concave
hemisphere on it. It would have a pin gnomon with a ball nodus at the end, at
the centre of the hemisphere. I understand that this is based in the Greek"
hemicyclium" but there.are a few 16
It's
http://www.sundialsoc.org.uk/
actually.
Thanks - I now understand ;)
Descriptions of both can be found in the BSS Glossary, under "Dial (types of") at
www.britishsundialsociety.org.uk.
Hi Alexei et al,
You asked:
> on another topic, what is the difference between a hemispherium and a
> hemicyclium?
Descriptions of both can be found in the BSS Glossary, under "Dial (types of")
at
www.britishsundialsociety.org.uk.
Regards,
John
---
dria, founded by Alexander the
Great some three hundred years before. The hemicyclium in question was
unearthed at the base of Cleopatra's Needle there; the numeral style
indicates it was there after Alexander (about 332 B.C.). This artifact now
resides in the British Museum.'
In sh
ndria, founded by Alexander the Great some three
hundred years before. The hemicyclium in question was unearthed
at the base of Cleopatraís Needle there; the numeral style indicates it was
there after Alexander (about 332 B.C.). This artifact now resides in the British
Museum.'
In
s
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