Re: Looking for a sundial 'twin': wide gnomon spider - second try with smaller photo NUMBER 2

[Fred Sawyer]

I recall seeing a similar design in an early 20th century Popular Mechanics
or Popular Science - one of those.

Fred Sawyer

On Thu, May 26, 2016 at 12:51 PM, Kevin Karney  wrote:

>
>
> Begin forwarded message:
>
> *From: *Kevin Karney 
> *Subject: **Re: Looking for a sundial 'twin': wide gnomon spider - second
> try with smaller photo NUMBER 2*
> *Date: *26 May 2016 at 17:50:46 BST
> *To: *Helmut Haase 
>
>
> On 23 May 2016, at 18:54, Helmut Haase  wrote:
>
> Hi,
> I have designed and realized a horizontal spider sundial with polar pointing
> wide gnomon, see details below and photo (in a second approach sadly reduced
> to 47 kB now). *Does anyone know **s**uch a sundial* *anywhere else?* I
> found many spider sundials but none with a *wide* polar gnomon. A photo
> link or any other information would be great?
>
>
>
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>
>
>
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Fwd: Looking for a sundial 'twin': wide gnomon spider - second try with smaller photo NUMBER 2

[Kevin Karney]

> Begin forwarded message:
> 
> From: Kevin Karney 
> Subject: Re: Looking for a sundial 'twin': wide gnomon spider - second try 
> with smaller photo NUMBER 2
> Date: 26 May 2016 at 17:50:46 BST
> To: Helmut Haase 
> 
> 
>> On 23 May 2016, at 18:54, Helmut Haase > > wrote:
>> 
>> Hi,
>> I have designed and realized a horizontal spider sundial with polar pointing 
>> wide gnomon, see details below and photo (in a second approach sadly reduced 
>> to 47 kB now). Does anyone know such a sundial anywhere else? I found many 
>> spider sundials but none with a wide polar gnomon. A photo link or any other 
>> information would be great?

---
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Re: Looking for a sundial 'twin': wide gnomon spider - second try with smaller photo

[Kevin Karney]

Dear Helmut

I have made such a dial for a friend in 5mm bronze, (so its gnomon is 5mm 
wide). It was cut with a water-jet (cost £250) and photo etched (cost £210). It 
contains sunrise and sunset lines. Somewhat similar to yours as far as density 
of hour lines etc, but somewhat smaller. 

The design was accomplished entirely from Python code (more than 2000 lines of 
code - a lot of which are the very precise astronomical algorithms). I made a 
number of laser-engraved/cut maquettes from 5mm plywood (about £10 each) to get 
the final design approved by my friend's children who paid the bill.  The 
software produced 3 different images - one for there laser-cutter, one for the 
water-jet cutter and one for the photo-etchers. 
Now I can produce a design similar to this one at any other Lat/Long in a very 
short time.

I'll send you other pictures by separate e-mail

The only other dial of this type I know in in the Parkes Observatory in New 
South Wales, Australia. You can find one image of it with a Goggle search 
"Parkes Observatory sundial"

Best regards
Kevin Karney
Freedom Cottage, Llandogo, Monmouth NP25 4TP, Wales, UK
51° 44' N 2° 41' W Zone 0
+ 44 1594 530 595


> On 23 May 2016, at 18:54, Helmut Haase  wrote:
> 
> Hi,
> I have designed and realized a horizontal spider sundial with polar pointing 
> wide gnomon, see details below and photo (in a second approach sadly reduced 
> to 47 kB now). Does anyone know such a sundial anywhere else? I found many 
> spider sundials but none with a wide polar gnomon. A photo link or any other 
> information would be great?

---
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