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 the name of this construction is Russell sundial?
I mean Prof. Russell Porter, the Palomar Mountain Observatory.
Any help, please.
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,
I agree that it looks like a cylindrical equatorial dial, but it is only
vaguely similar to Porter's. Look at the difference in the gnomon and its
alignment. I'll try to dig up a better photo of Porter's dials.
Cheers,
Sara
-Original Message-
From: LJ Coletti
FYI: Bert Willard, curator of the Springfield Telescope Maker's museum
in Springfield, Vermont has indicated that he will bring both that very
same James Hartness dial, and a Russel Porter mystery dial, to the NASS
convention this August in Burlington, Vermont.
-Bill Gottesman
LJ Coletti
Sarah Schechner and Sundials:
Here is a link to a picture of the Porter sundial, with details of its fate.
http://palomarskies.blogspot.com/2009/04/russell-porters-missing-sundial.html
Gordon Uber
http://palomarskies.blogspot.com/2009/04/russell-porters-missing-sundial.html
Schechner
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
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