Hello Sara,
I understand your concern to the term monoFILAR as it isn't restricted to
a dial with a string.
The same remark can be made to the term biFILAR.
Nevertheless the word bifilar is quit common since the original invention of
this type of dial in which 2 threads were used.
Because of
Hello Sara,
The term Universal dial is very useful to indicate that the dial can be
used at several latitudes.
Adding the range of latitudes where this is true is good idea.
But still I haven't any idea what type of dial it is.
It may be a universal ring dial or a universal bifilar dial or a
I try to answer to some of the last messages on the subject
John Carmichael has written:
And I give you think that we should stop using the term monofilar to
describe Singleton dials?
I don't know the Singleton Sundial and so I cannot answer
--
Sara Schechner
fer j. de vries [EMAIL PROTECTED] writes:
Back to the bifilar dial : A bifilar dial can be constructed in such
a way that the hourlines ( for local suntime ) are equi-angular
spaced. Than it is also possible to correct for EoT and/or
longitude by rotating the hourscale. So we have at least
Arthur,
The first dial you described was invented in the first half of the 17th
century by Samuel Foster in London. It was subsequently rediscovered by
J.H. Lambert, and has had a number of subsequent rediscoveries since. See
my article:
Fred Sawyer, A Self-Orienting Equiangular Sundial,
Dear List members,
Have we come to any agreement on what to call dials of the type
suggested by John Singleton (page 51 of the BSS Bulletin for February
2000)? If not Singleton dials, then what?
For the benefit of those on this list who haven't seen the drawing, I
attach a small GIF file
Gianni wrote:
The Monofilar and Bifilar sundials can be built with any kind of Time:
Middle Time (Standard), Local Apparent Time, with Italic, Babylonian,
Temporary hours, etc.
Ah ha! I must have misunderstood the issue being discussed.
I can see that in abstract terms that we have dials
Arthur,
I spent many idle hour trying to come up with a sundial that would allow an
easy
mechanical correction for the equation of time.
Let me then alert you to an article that is currently projected for the June
issue
of the Compendium: Kratzer Layout, Yabashi Point Sawyer Equant. The
Should the (projection) dial types by axial, linear, and bi-linear?
-Original Message-
From: Steve Lelievre [mailto:[EMAIL PROTECTED]
Sent: Monday, February 28, 2000 3:34 PM
To: Sundial mailing list
Subject: Re: Azimuthal sundials - again
Gianni wrote:
The Monofilar and Bifilar
Hi,
There are a number of threads which have come up in the past few
months to which I've intended to reply, but work, the holidays and a
research trip to India have all intervened. So, here with a bit of bottle
age are a few threads which bear on my primary subject: the Dodwell Dial.
Dodwell's dial is novel in several respects. His most radical
innovation is to cut Ferguson's dial in half (that's how I imagine it, any
way!) and to transpose the two halves. This permits his dial to operate
from earliest sunrise to full sunset. The shadows are cast by two vertical
Peter Mayer contributed:
snip
i) the search for the beautiful, accurate dial.
The one bit of this thread which I have came, I think, from Tony Moss:
What the world needs are some beautiful, accurate and durable sundial
designs that can be adjusted for any location, that tell Standard
I should point out that my dial reads time by a
projection of a point onto a point (the first point being on a surface)
and that it reads standard time.
Dan Wenger
Gianni wrote:
The Monofilar and Bifilar sundials can be built with any kind of Time:
Middle Time (Standard), Local Apparent
From: Daniel Lee Wenger [EMAIL PROTECTED]
I should point out that my dial reads time by a
projection of a point onto a point (the first point being on a surface)
Oops, I knew that...
and that it reads standard time.
...but I didn't know that.
Apologies,
Steve
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