I’m pretty sure there was one of these in an early version of Jane Walker’s
“Make a Sundial” British Sundial Society publication.
There is also one on the rear of Jim Morrison’s astrolabe.
Mike Shaw
53º 22'N 03º02'W
www.wiz.to/sundials---
https://li
On 21/06/2011 18:09, Mike Shaw wrote:
I'm pretty sure there was one of these in an early version of Jane
Walker's "Make a Sundial" British Sundial Society publication.
There is also one on the rear of Jim Morrison's astrolabe.
Mike Shaw
53º 22'N 03º02'W
www.wiz.to/sundials
The equation graph projected on a circle is used as a "kidney piece" cam in
a watch movement that can indicate the equation.
Here is a picture of the gear carrying the kidney piece. It turns once a
year.
http://people.timezone.com/mdisher/decorte/gyro2/gyro2_3.jpg
Bob
_
Fro
can it be purchased. I’ve never seen a watch with EOT
indication.
Thanks,
Roderick Wall.
From: Robert Terwilliger
Sent: Wednesday, June 22, 2011 5:55 AM
To: clc...@mx.nthu.edu.tw ; sundial@uni-koeln.de
Subject: RE: EoT diagram
The equation graph projected on a circle is used as a "k
williger ; clc...@mx.nthu.edu.tw ; sundial@uni-koeln.de
Subject: Re: EoT diagram
Hi ChiLian and Robert,
Thanks ChiLan, your EOT curve is interesting. I suppose anything to do with
sundials has a high chance of being invented before as sundials have been
around for a long time.
Robert, the kidn
Hi again,
This is a good link on EOT and watches
http://www.timezone.com/extras/200711101492
Roderick Wall.
From: R Wall
Sent: Wednesday, June 22, 2011 7:08 AM
To: Robert Terwilliger ; clc...@mx.nthu.edu.tw ; sundial@uni-koeln.de
Subject: Re: EoT diagram
Hi all,
After sending my last email
Sent: Tuesday, June 21, 2011 3:55 PM
To: clc...@mx.nthu.edu.tw; sundial@uni-koeln.de
Subject: RE: EoT diagram
The equation graph projected on a circle is used as a "kidney piece" cam in
a watch movement that can indicate the equation.
Here is a picture of the gear carrying the k
e.jpg
Bob
_
From: R Wall [mailto:maill...@virginbroadband.com.au]
Sent: Tuesday, June 21, 2011 6:06 PM
To: Robert Terwilliger; clc...@mx.nthu.edu.tw; sundial@uni-koeln.de
Subject: Re: EoT diagram
Hi again,
This is a good link on EOT and watches
http://www.timezone.com/e
Hi ChiLian,
Thanks for your plot. Here's an picture of a very clever use of the
cam by Mac Oglesby to adjust a vertical Foster-Lambert dial which
appeared in the Compendium Vol 10, No. 4 in 2003.
best wishes,
Peter
On 22/06/2011 01:41, Chiu 邱,Chi lian wrote:
Hi,
I figured out a way to
PM
> To: Robert Terwilliger; clc...@mx.nthu.edu.tw; sundial@uni-koeln.de
> Subject: Re: EoT diagram
>
> Hi again,
>
> This is a good link on EOT and watches
>
> http://www.timezone.com/extras/200711101492
>
> Roderick Wall.
>
> From: R Wall
> Sent: W
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.
>
>
Hi Bob,
If you have a look at the Jules Audemars Equation of Time watch movement in my
link you will see a kidney piece.
Roderick Wall.
From: Robert Terwilliger
Sent: Wednesday, June 22, 2011 9:43 AM
To: 'R Wall' ; clc...@mx.nthu.edu.tw ; sundial@uni-koeln.de
Subject: RE: E
Chi Lian
It's good to see someone thinking about the EoT !
And to other contributors, many thanks for your additions concerning watches
and clocks, which I was most interested to see
If you visit
www.PreciseDirections.co.uk
Click on the Sundials link and then click the last item on the list th
f the timepiece was a
perpetual calendar there must have been some additional mechanism for
February.
Bob
_
From: David Bell [mailto:db...@thebells.net]
Sent: Tuesday, June 21, 2011 10:51 PM
To: Robert Terwilliger
Cc: ;
Subject: Re: EoT diagram
I see how the kidney piece works
Hi Kevin,
The cam demonstration is great! And so are the other links and
animations. Thanks for alerting us to you webpage.
best wishes,
Peter
On 22/06/2011 19:58, Kevin Karney wrote:
Chi Lian
It's good to see someone thinking about the EoT !
And to other contributors, many thanks for
.
Jack
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On
Behalf Of R Wall
Sent: Tuesday, June 21, 2011 8:19 PM
To: Robert Terwilliger; clc...@mx.nthu.edu.tw; sundial@uni-koeln.de
Subject: Re: EoT diagram
Hi Bob,
If you have a look at the Jules Audemars
for the information about the Real-Time-Clock.
Roderick Wall.
From: Jack Aubert
Sent: Thursday, June 23, 2011 9:17 AM
To: 'R Wall' ; 'Robert Terwilliger' ; clc...@mx.nthu.edu.tw ;
sundial@uni-koeln.de
Subject: RE: EoT diagram
By the late 17th century, as clocks became more a
Flamsteed (1692), who clearly set out
the two principal causes.
Jack
From: R Wall [mailto:maill...@virginbroadband.com.au]
Sent: Wednesday, June 22, 2011 7:46 PM
To: Jack Aubert; 'Robert Terwilliger'; clc...@mx.nthu.edu.tw;
sundial@uni-koeln.de
Subject: Re: EoT diagram
Hi Jac
Dear Kevin,
I was interested in your comments on EoT.
I agree that the kidney curve is not very
pretty. You would be happier if we could
go back to the year 1246 when the analemma
had mirror symmetry about its long axis.
This would tidy up the kidney a little!
You say...
> ...the master of all
On Thursday, June 23, 2011 9:33 AM, Frank King,
commenting on Kevin Karney's posting, said
> > ...the master of all mechanical EoT
> > generators must be the device in the
> > Strassburg cathedral clock.
>
> You overlook the mechanism in the
> Jens Olsen World Clock in Copenhagen.
>
> This clock
Dear Chris,
As always, you prompt further thought...
> Gears, although limited to an integral number
> of teeth, are essentially analogue devices,
> aren't they?
Er, not sure :-)
In earlier days, I spent many a happy hour
looking at clocks and counting teeth. That
felt like a digital experienc
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