Thibaud Taudin-Chabot wrote:
That sundial is not 1 spot projected on the floor, but the whole
sundial pattern projected on the floor. On the floor you only need 1
readingmark, nothing more.
I understand; I mentioned it as an example of dark spots being projected
on the receiving surface,
That sundial is not 1 spot projected on the floor, but the whole sundial
pattern projected on the floor.
On the floor you only need 1 readingmark, nothing more.
But the shadow of a spot on a window will be very difficult to find on a
sunlit floor because the light of the sunlit floor is
On Sat, 6 Sep 2003, John Carmichael wrote:
We're also discussing what I call antiaperture gnomon sundials. These are
neat. Imagine a large clear pane of clear or light colored glass on a wall.
And on this glass is a small very dark dot. Instead of a hole in a wall
casting a beam of light,
On Sat, 6 Sep 2003, J. Tallman wrote:
Perhaps there is a good ratio to use for dot/disc size vs. distance to
the shadow field? Perhaps some of the list members know the answer to
this...
Jim
1/107 had stuck in my mind, and I made a quick test a few minutes ago. We
have near-horizontal
On Sat, 6 Sep 2003, Mac Oglesby wrote:
107:1 seems to be the ratio between the projection distance from a
pinhole to a screen and the diameter of the Sun's image. That is, the
diameter of the Sun's image will be about 1/107th of the distance
from the projecting pinhole.
Since a pinhole
I have also considered using this type of arrangement (a dot on a
clear pane) for several projects in the past. I wonder just how big the
dot would have to be? I assume penumbral effects would be at play, and
the distance to the shadow receiving surface would probably be a factor
in
: Saturday, September 06, 2003 3:23 AM
Subject: Re: Fw: Sundial Carpet
I have seen some decorative floors made from coloured linoleum. This
material
is now available in a wide range of colours, from pale pastels to dark
rich
shades (unlike the traditional drab brown).
The floors are made
Hi John,
We're also discussing what I call antiaperture gnomon sundials. These are
neat. Imagine a large clear pane of clear or light colored glass on a wall.
And on this glass is a small very dark dot. Instead of a hole in a wall
casting a beam of light, the dark spot casts a shadow onto
Hello Jim,
William Walton's Pinholes and Shadow Sharpeners and Gianni
Ferrari's The Shadow Sharpener, each in Compendium 9-4, December
2002, deal with this question.
107:1 seems to be the ratio between the projection distance from a
pinhole to a screen and the diameter of the Sun's image.
]
To: sundial@rrz.uni-koeln.de
Sent: Friday, September 05, 2003 12:29 PM
Subject: Re: Fw: Sundial Carpet
This seems a valid concern.
Would a hanging banner work? If thin enough or of the right quality
cloth, it
could be viewed from both sides in the hall/lobby. It would then be out
made it thru the internet.
- Original Message -
From: John Carmichael [EMAIL PROTECTED]
To: Sundial List sundial@rrz.uni-koeln.de
Sent: Wednesday, September 03, 2003 11:08 AM
Subject: Sundial Carpet
Hello All:
A person who does solar consultations and experiments
://advanceassociates.com/Sundials/Stained_Glass
- Original Message -
From: Claude Hartman [EMAIL PROTECTED]
To: sundial@rrz.uni-koeln.de
Sent: Friday, September 05, 2003 12:29 PM
Subject: Re: Fw: Sundial Carpet
This seems a valid concern.
Would a hanging banner work? If thin enough
://www.sundialsculptures.com
Stained Glass Sundials Website:
http://advanceassociates.com/Sundials/Stained_Glass
- Original Message -
From: Claude Hartman [EMAIL PROTECTED]
To: sundial@rrz.uni-koeln.de
Sent: Friday, September 05, 2003 12:29 PM
Subject: Re: Fw: Sundial Carpet
This seems
excuse me if this is a resent message, but I'm resending because I
don't think the original made it thru the internet.
- Original Message -
From: "John Carmichael" [EMAIL PROTECTED]
To: "Sundial List" sundial@rrz.uni-koeln.de
Sent: Wednesday, September 03, 2003 11
[EMAIL PROTECTED]
To: Sundial List sundial@rrz.uni-koeln.de
Sent: Wednesday, September 03, 2003 11:08 AM
Subject: Sundial Carpet
Hello All:
A person who does solar consultations and experiments for architects (she
uses a heliodon) contacted me after having viewed the Stained Glass
: Sundial Carpet
Hello All:
A person who does solar consultations and experiments for architects (she
uses a heliodon) contacted me after having viewed the Stained Glass
website. A new library is being built in Washington state and she is
wants
to incorporate an interior sundial in the main
discussed how to put the drawing on the floor, I suggested using a
colorful design woven in the carpeting. I know that it is now possible to
order a custom-woven carpet that uses digital computer aided equipment to
reproduce any design.
Have any of you ever heard of a sundial carpet?
John
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