Richard,
That particular dial was designed by James Hartness (URL below).
http://www.hartnesshouse.com/vermont-museum/hartness-porter-museum.shtml
Luke Coletti
On 5/20/2010 12:31 PM, kool...@dickkoolish.com wrote:
Here is one of the Porter sundials in Springfield VT.
Sara,
That looks similar to a cylindrical equatorial dial done by Porter while
at CalTech. The dial incorporated EoT correction and was, apparently,
stolen (URL below).
http://pr.caltech.edu/periodicals/caltechnews/articles/v42/sundial.html
Luke Coletti
On 5/20/2010 12:34 PM, Schechner, Sara
: sundial-boun...@uni-koeln.de
To : ? sundi...@mail.ru
Cc : sundial@uni-koeln.de
Date : Thu, 20 May 2010 18:49:41 -0400
Subject : Re: Russell Porter Sundial?
I think the dial could be called a Polar dial, but I favor Equatorial,
because
THe drawing n° 2
(sorry but the limit of this Sundial Mailing list is only 50kb!!!)
Nicola Severino
attachment: N. 2 horolabium with vertical gnomon.jpg---
https://lists.uni-koeln.de/mailman/listinfo/sundial
Nicola,
Great explanation of terminology. I completely agree and applaud your use of
the historical literature for guidance.
All best,
Sara
Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific
Instruments
Department of the History of Science,
...@groknet.net]
Sent: Thursday, May 20, 2010 4:04 PM
To: Schechner, Sara
Cc: sundial@uni-koeln.de
Subject: Re: Russell Porter Sundial?
Sara,
That looks similar to a cylindrical equatorial dial done by Porter while
at CalTech. The dial incorporated EoT correction and was, apparently,
stolen (URL
Here is one of the Porter sundials in Springfield VT.
http://www.dickkoolish.com/rmk_page/RMK_Pictures/S60-07-31-06/IMGP0754.JPG
Friends,
Is there a conventional name (like horizontal', equatorial', polar' and
so on) for the sundial constructed as shown below?
Am I right thinking that
I have never seen this form associated with Russell Porter, but will check
further.However, I think we need more information to tell the conventional
type. For example, is the long rod the gnomon, and is it to scale with the
arc? What do the hour lines look like? Does the sundial include
Richard,
That particular dial was designed by James Hartness (URL below).
http://www.hartnesshouse.com/vermont-museum/hartness-porter-museum.shtml
Luke Coletti
On 5/20/2010 12:31 PM, kool...@dickkoolish.com wrote:
Here is one of the Porter sundials in Springfield VT.
Sara,
That looks similar to a cylindrical equatorial dial done by Porter while at
CalTech. The dial incorporated EoT correction and was, apparently, stolen (URL
below).
http://pr.caltech.edu/periodicals/caltechnews/articles/v42/sundial.html
Luke Coletti
On 5/20/2010 12:34 PM, Schechner,
]
Sent: Thursday, May 20, 2010 4:04 PM
To: Schechner, Sara
Cc: sundial@uni-koeln.de
Subject: Re: Russell Porter Sundial?
Sara,
That looks similar to a cylindrical equatorial dial done by Porter while
at CalTech. The dial incorporated EoT correction and was, apparently,
stolen (URL below).
http
...@groknet.net]
Sent: Thursday, May 20, 2010 4:04 PM
To: Schechner, Sara
Cc: sundial@uni-koeln.de
Subject: Re: Russell Porter Sundial?
Sara,
That looks similar to a cylindrical equatorial dial done by Porter while
at CalTech. The dial incorporated EoT correction and was, apparently
I think the dial could be called a Polar dial, but I favor Equatorial,
because the hour marks will be evenly spaced along a cylindrical
surface, typical of many equatorial dials. How about shaking things up
a bit, and calling it a Polar Equatorial? Definitely not horizontal.
-Bill Gottesman
Dear Sara, Bill and others,
As it frequently happens, a very simple question causes an entire scientific
and historic problem.
I make a set of six public brass sundials for children. At the stage of making
the informational brass plaques, which are to be installed near sundials, we
realized
Dear Sundialers,
Thanks to a number of you good folks inputs on methods of retreiving patents,
here is a
tinyurl address for the first page of Russell Porter's patent on the Reflecting
Telescope.
http://tinyurl.com/23w6gy
If you do not see the first page of the patent with it's drawing you
Wall.
- Original Message -
From: Edley McKnight
To: Mac Oglesby ; Sundial List
Sent: Wednesday, May 16, 2007 4:13 AM
Subject: Re: Russell Porter sundial
Hello Mac,
The Patent for Porter's reflecting telescope is available directly from the
patent office's online site
An original Porter Garden Telescope recently sold at the
Skinner auction in Boston.
http://www.dickkoolish.com/rmk_page/pictures_032207.html
There a couple of Porter sundials in the telescope making museum
at the Hartness House in Springfield VT.
Richard M Koolish wrote:
And there is the dial on the clubhouse at Stellafane.
http://www.dickkoolish.com/rmk_page/pictures_080905.html
There is an excellent picture of the Russell Porter Stellafane vertical
sundial also on the NASS Sundial Registry. Visit the NASS website at:
Hello Mac,
The Patent for Porter's reflecting telescope is available directly from the
patent office's online
site at a huge long url, which is too long to type in or put on a single line.
You can just go to:
http://patft.uspto.gov/netahtml/PTO/search-bool.html
and search for telescope in
The Patent for Porter's reflecting telescope is available directly from
the patent office's online
site at a huge long url, which is too long to type in or put on a single
line.
For future reference, there's an easy fix for that problem:
Once you have navigated to the site with the long URL,
Hi Mac,
I have only hearsay evidence, but I'm told, since it has a latitude setting
ring, a declination
setting ring and an hour angle ring, when the eyepiece and prism are removed
and the main
mirror focused on the sun, as observed on a surface placed at it's focal point
the declination
Hi Mac and All,
Thanks for the link to the Russell Porter Garden Telescope but of more
relevance to this list is the Russell Porter Sunclock. Luke Coletti bought
one at Stellafane in 1998. See http://www.gcstudio.com/gcstudio.html and
scroll down to the Russell Porter Sunclock.
I agree with
Mac,
I suspect that if you aim the telescope at the sun then the hour circle
will show the local time.
In Porter's (Scientific American) Amateur Telescope Making, probably
Volume I, there is a sketch of a sundial based on a spherical chemist's
flask. As I recall, a lens in the neck was aimed
23 matches
Mail list logo
