Sure, a vertical north location with a mirror facing south. I thought of that
when you first posted, and I have a perfect large north wall, but I'm having
trouble visualizing how to mount a mirror so the house doesn't shade it and the
projected dial isn't too huge...
Dave
Sent from my iPhone
Laser sintering 3D printing is definitely a current process! Bronze, stainless,
and others.
Dave
Sent from my iPhone
> On Dec 5, 2014, at 5:30 AM, Tony Moss wrote:
>
> Hi all,
> I mentioned the possibility of making elaborate pierced gnomons
> using 3D printing in a very recent art
And when your bank inevitably informs that your bank card MAY have been
compromised, it's only one place to have to update...
Dave
Sent from my iPhone
> On Aug 15, 2014, at 12:46 PM, "Jack Aubert" wrote:
>
> Hi Dan,
>
> Beautiful project. I’m also in for a minor contribution.
>
> I like
I don't know the name, but I believe the moveable "attachment point" is where
the hanging loop clamps to the dial plate. Moving that will rotate the dial and
altitude scale relative to vertical.
Dave
Sent from my iPhone
> On Jun 1, 2014, at 3:13 PM, Steve Lelievre
> wrote:
>
> Hi folks,
>
Great analemma (Lanalemma?) photo!
So, how does it continue, month by month? In a spiral fashion, then return over
the same area of the sky, after slowing to a halt? Are there "lunastices",
then? If so, how do they correspond to the solstices!
Dave
Sent from my iPhone
> On May 30, 2014, at 2:
One thought on that gray posting, Roger:
I may remember incorrectly, but I thought illuminance on a surface was
proportional to the square of the cosine of the incidence angle.
Dave
Sent from my iPhone
On Jan 2, 2014, at 8:07 PM, "Roger Bailey" wrote:
> Hello Marcelo,
>
> Many on this list
I want to see how we'll they treat it in the movie,,,
Sent from my iPhone
On Sep 27, 2013, at 11:14 AM, rmallett wrote:
> On 27/09/2013 18:52, David Bell wrote:
>> If Google cant help, you could try contacting our NSA! Or, from more recent
>> events, your GCHQ...
>>
If Google cant help, you could try contacting our NSA! Or, from more recent
events, your GCHQ...
Dave
Sent from my iPhone
On Sep 27, 2013, at 10:43 AM, Tony Moss wrote:
> Hi all,
> A thousand apologies to anyone who has had trouble with this nasty
> event. My email password is now
Clever idea... The direct reading view of the Sun is quite different! The
user's eye becomes a nodus withe the dial plate above. I could see this with a
dark neutral density film in a ceiling window...
Dave
Sent from my iPhone
On Aug 31, 2013, at 2:27 PM, kool...@dickkoolish.com wrote:
> I fo
Martina, I might also suggest an inverted golf tee for a gnomon. Should be tall
enough for an A4 tabletop dial.
Dave
Sent from my iPhone
On Mar 6, 2013, at 7:09 PM, Martina Addiscott
wrote:
> In message <000e01ce1a7b$7f374030$7da5c090$@waitrose.com>
> "Jackie Jones" wrote:
>
>>
John, your railway is absolutely stunning! The artisanship you have put into
every detail is a match for your stone and stained glass work. This immediately
struck me as a worthy outdoor successor to John Allen's great "Gorre &
Daphetid" (and fortunately, near fireproof)... It's good to see you
Server not found?
Sent from my iPhone
On Dec 13, 2012, at 2:51 PM, Darek Oczki wrote:
> Dear Friends.
>
> I am about to publish a limited edition of a sundial calendar for year 2013.
> It is my third production and it is very exclusive - the number of copies
> will be limited. The calendar
Brian, what you need to keep in mind is that pig-headed prejudice probably
predates the Bronze Age, and certainly does Judaism, Christianity and Islam!
Dave
Sent from my iPhone
On Sep 14, 2012, at 9:00 AM, brianalbinson wrote:
> Martina
>
> We do not have the problem in Canada, although I w
That might not be *the* reason, but I am certain that Google search on your
computer does "know you". Pros and cons...
-Original Message-
From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Roger
Bailey
Sent: Monday, August 27, 2012 8:52 PM
To: Tony Moss; Frank King
Cc: sundia
It has little or nothing to do with controlling the students, or even concern
over their welfare. It all comes down to liability.
Should some child be injured in a schoolyard scuffle, or 20 years later develop
a skin cancer, some shyster lawyer WILL find a way to hold the school
responsible!
Several times, there have been discussions about how to improve the shadow cast
by a "point" nodus. I partially recall some conclusions regarding the optimum
diameter vs, throw length, and some thoughts about adding an annular ring to
take advantage of diffraction.
Can anyone help remind me?
T
If you are running Windows, there's a slick free utility out there: Gadwin
Print Screen.
Hit PrintScreen and it let's you capture just what part of the screen you want,
either to clipboard or to a file, in several formats.
Dave
Sent from my iPhone
On Feb 6, 2012, at 3:58 PM, "Roger Bailey"
27;help' to
>> sundial-requ...@uni-koeln.de
>>
>> You can reach the person managing the list at
>> sundial-ow...@uni-koeln.de
>>
>> When replying, please edit your Subject line so it is more specific
I guess the problem is that it isn't *everyone's* common heritage. But what
else do we have? All traditional bases for calendars are either religious or
provincial to some heritage. I could suggest Julian dates as astronomers use,
but that's Judeo-Christian too.
The Romans were good at includin
Date and Latitude are very important parameters.
On the Equator at an Equinox, the path is a straight line, due West until noon,
then returning essentially to the start.
At the pole, at a Solstice, it should be a circle, diameter of 24*speed/Pi,
tangent to the Sun's direction at the start ti
Actually, if my physics recollection is correct, the light rays (or shadows)
bend twice for each pane. Once on entry, "towards" the glass (denser medium),
then again on exit, paralleling the entering ray (assuming same density medium
on both sides of the glass). This introduces an offset whose m
Very likely
No
No!
And I also feel this was a perfectly reasonable posting.
To add an appropriate "dialing problem", consider what type of dial would be
most practical. Not many modern graveyards (in the US, I should say) have the
flat concrete slab grave cover, so a horizontal is not the best
Create a uniquely crafted armillary sphere for your friend! It could pack in a
table lamp sized box for those many moves. It can be truly universal and can be
installed and adjusted for any location.
The only tricky part would be if they were to be stationed on the southern
hemisphere. You'd ne
Dialist gurus wil certainly correct me if I'm wrong, but:
"My longitude 116' is facing north or down."
Your longitude (meridian) should be facing south or up, so it gets full sun at
Noon, just as your house does.
Dave
Sent from my iPhone
On Jul 14, 2011, at 1:01 PM, Brent wrote:
> My longitu
The angle your globe is currently oriented looks correct, so maintain that if
you remount it. However, unless you live in eastern Europe, you need to spin
the globe
Your location should lie in the meridian plane, toward South (as you are in
the Northern hemisphere.) Your city will be directly
I see how the kidney piece works, but what's with the oddly shaped Month wheel?
Sent from my iPhone
On Jun 21, 2011, at 12:55 PM, "Robert Terwilliger" wrote:
> The equation graph projected on a circle is used as a "kidney piece" cam in a
> watch movement that can indicate the equation.
>
>
Nice! I love the 1 RPYear wheel!
Sent from my iPhone
On Jun 21, 2011, at 4:43 PM, "Robert Terwilliger" wrote:
> Roderick,
>
> The eot watch your link produced does not seem to be mechanical – hence no
> kidney piece.
>
> Google
> movement equation of time watch
>
> Then try the images
>
The only conceivable problem that I could suggest is related to the complaints
(were they also from the UK?) of outdoor dials being an "attractive nuisance".
I can see a flock of unruly kids pushing and shoving to each have a go at the
dial. Eventually someone would get hurt, and the local Counc
That's still around one part in 10^8 over a year, not quite 6 decimal places of
days, but very close!
Sent from my iPhone
On Mar 26, 2011, at 11:04 AM, Brooke Clarke wrote:
> Hi:
>
> It turns out that because of "seeing" you can not determine meridian crossing
> to better than about 5 arc s
Good thought, Larry!
Make the tether long enough to drop the gnomon below the dial...
Dave
Sent from my iPhone
On Jan 9, 2011, at 12:21 PM, "Larry Bohlayer / Celestial Products"
wrote:
> John,
>
> Here are some thoughts on additions to your design for the magnetic gnomon:
>
> 1.) a “k
John, I believe these are essentially one piece - the magnet is permanently
attached inside the cup.
You'd want a separate magnet and ferromagnetic cup, not stainless steel.
Dave
Sent from my iPhone
On Jan 5, 2011, at 8:40 AM, "John Carmichael" wrote:
> They have just what we need!
>
> The
Very likely not, Mike. Force drops off rapidly with distance.
One think that hasn't been suggested is attaching a magnet with adhesive. The
cement used to fix rear-view mirrors to windshields is amazing stuff...
Dave
Sent from my iPhone
On Jan 4, 2011, at 3:29 PM, "Mike Shaw" wrote:
> John
>
Oops - I was a few months off!
Sun would be that high in June, not now...
Dave
Sent from my iPhone
On Sep 28, 2010, at 7:07 PM, "Dave Bell" wrote:
> That’s just priceless!
> Not unreasonable: The hotel façade is a circular arc, facing a hair West of
> South.
> With its coordinates of N 36.109
I'm still waiting to find an embedded message from the Architect!
Fun: http://pi.nersc.gov/
Dave
Sent from my iPhone
On Sep 21, 2010, at 8:53 AM, "J. Tallman"
wrote:
> Hello All,
>
> Some of you may be interested in this recent development:
>
> http://www.bbc.co.uk/news/technology-113131
Www.iaps.info
Sent from my iPhone
On Jul 26, 2010, at 2:01 PM, "Edley McKnight" wrote:
Hi Larry,
It is probably "the International Association of Physics Students"
I've seen references like that several places.
I don't know how to contact them.
Regards,
Edley.
Date sent:
As I recall, so does Orologi Solari.
You'd still need some means of capturing the frames.
Sent from my iPhone
On Feb 11, 2010, at 6:51 AM, "John Carmichael"
wrote:
>
> Hi Daniel:
>
> Shadows Pro has an easy to use shadow animation feature now.
>
> John C.
>
>
> -Original Message-
> Fr
Lovely modern dial, and a great concept!! Ideal for a low wall like
this, particularly if direct South and at low latitudes. I'd love to
find a site near here to try this.
Dave
Sent from my iPhone
On Nov 2, 2009, at 2:26 AM, "robic.joel" wrote:
Hi John, Patrick, Willy, Fer and all,
Here
Very nice! I was thinking of it on a flat surface, with the tubes
variously inclined, but this spherical model works great, too. Call it
a Sea Urchin dial, maybe...
Dave
Sent from my iPhone
On Sep 6, 2009, at 11:36 AM, Rodney Heil wrote:
> I made a quick POV-ray model of my conception of a
it seems. I've not seen any written material on Slot
Shadow dials. If someone knows of any, please enlighten me.
Best Wishes!
Edley.
From: David Bell
> I can see this as a "sea" of short posts, like anemone tentacles,
> all
> at unique angles
I can see this as a "sea" of short posts, like anemone tentacles, all
at unique angles. Perhaps time (and date) inscribed on their tops...
Dave Bell
Sent from my iPhone
On Sep 4, 2009, at 10:20 AM, "Edley McKnight" wrote:
> It could be composed of the solid shadow sections of a nodus gnomon
Roger, I should know better than to read responses like this during
boring meetings at work! GD, indeed...
Sent from my iPhone
On Sep 2, 2009, at 10:24 AM, "Roger Bailey" wrote:
> A great collection of gnomons. Thanks John
>
> Some day I will collect pictures showing the problem of "gnomon
>
Look for several of Zarbula's dials at our Painted Wall Sundials site:
http://advanceassociates.com/WallDial/PWS_Home.html
Dave Bell
John Carmichael
Sent from my iPhone
On Aug 24, 2009, at 2:02 PM, "Mario Arnaldi" wrote:
Dear friends,
in order to page an article about Zarbula written by our
If for historical and nostalgic reasons alone, your "exotic languages"
versions are a great addition! Since I got out of college just before
anything useful was taught in computer science/compting theory, I
learned mostly on my own. CACM Journal entries in Algol were and still
are of histor
But Tony, it's Art!
How can you put a price to it??
On Jun 15, 2009, at 10:44 AM, Tony Moss
wrote:
> Andrew Pettit wrote:
>> Fantastic!
>>
>> At 200,000 Euros is it also the world's most expensive sundial?
>>
>> Regards
>>
>>
> Not by miles! During the BSS Safari to Nuremberg we were shown a
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