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[jmikeshaw--- via sundial]

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A Pilkington & Gibbs Type 2 Heliochronometer (Serial Number 687) has recently 
been stolen from Spetchley Gardens, Worcestershire, UK.
This instrument was originally purchased directly from P and has been 
continuously owned by the Berkeley family.

An original P catalogue shows, under the heading "The Heliochronometer has been 
supplied to":
The Rt. Hon. The Earl of Berkeley, Foxcombe, Oxford.
Clearly, the family are anxious to trace the whereabouts of the stolen dial.

Fortunately, the serial number is known (687), so should you come across any 
reference to this dial, (auctions, eBay etc.) please be kind enough to inform 
the current owner, Henry Berkeley.
He can be contacted at:
henry.berke...@berkeleyestate.co.uk

Many thanks

J.Mike Shaw
53º22'N  3º02'W



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Re[2]: St. Hildevert

[jmikeshaw]

<...>>


In the VXII th??

Mike Shaw



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Re: The duration of the year

[jmikeshaw]

Doug,

If you lived 1000 years ago, in temperate latitudes,  you would see the 
sunrise and sunset azimuths move closer together as the winter solstice 
approached.

They would then stop and move apart again.
Knowing nothing about why this happened, you would worry in case one 
year they kept going and you would be left in permanent darkness.

To check, you would set up standing stones as markers for reassurance.
You might also set other stones to mark the summer solstice and even the 
equinoxes.
If you counted the days between the recurrence of identical events over 
several decades (requires recording of information across generations)

you would eventually come to the 365.25 figure.

But why are you choosing 1000 years ago?
The Egyptians knew this way before, because they had to be able to 
predict the Nile Floods.

I understand that they used Sirius rising as their marker.

Mike Shaw
53º22'N  3º02'W
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Re[2]: Leap Second Quiz Question

[jmikeshaw]

Frank wrote:
<>

I was at a talk recently by a guy who was promoting the use of tidal 
energy.

(You know what you are going to get every day was his main theme"

At the end he invited questions, so I asked if the generation of 
electricity by the use of tidal power would slow down the earth or moon.

He looked nonplussed.
I guess it might - comments welcomed.

Mike Shaw
53º21' N  3º02'W


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Re: Leap Second Quiz Question

[jmikeshaw]

Well I think I'll go for 0.5 seconds.

Frank's clock has apparently gained 1.5 seconds in the week.
The radio clock stopped for 1 second at midnight, but Frank's didn't and 
so gained 1 second.


Mike Shaw



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Re: Precise locations

[jmikeshaw]

Ian wrote:
<>

SatNav is similarly 2 dimensional.
I was travelling south towards Liverpool (UK) when my wife said she wanted to 
visit the Liverpool Costco store.
I wasn’t sure of its location, so I put the store postcode into the car SatNav, 
but it directed me into the Mersey Tunnel.
About 300 yards into the tunnel it said “You have now reached your destination”.
l later found that the store is situated directly above the tunnel.

My wife still thinks that I did it deliberately.

Mike Shaw
53º 21' N 3º02' W
w3w: firm:become:void

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Re: Sombrero as a sundial

[jmikeshaw]

Our very own Joanna Migdal (now Lady White) designed and wore a sundial hat to 
the Ascot Races back in 2009.
Note Lord White with compass in hand to ensure correct orientation.

See:  http://www.sundialsomething.com/index_files/page0024.htm

Mike Shaw
53º 21' N 3º02' W
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Re: Using analemmatic sundials for determining sun exposure times

[jmikeshaw]

I just received this from Andrew James
=

Very ingenious! For a flat wall, I think it's probably a north-facing wall
at the tropic of Cancer at June midsummer (or South-facing at Tropic of
Capricorn at their midsummer), about 13h 35m, as that is so counter
intuitive, the sun being North of the wall all day (I think?).

Andrew James
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Re: Using analemmatic sundials for determining sun exposure times

[jmikeshaw]

Frank,

You only said a vertical wall, not a straight vertical wall, so I'll go for 
24 hours on a cylindrical lighthouse wall above (or below) the arctic (or 
Antarctic) circle.



Mike Shaw
53º 21' N 3º02' W

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Re: Moon phase calculator

[jmikeshaw]

>

I have a moonstick sliderule and it works well, but beware that it uses the 
calendar change from Julian to Gregorian as happening in 1582.

So, take care if you live in one of those countries where it didn't.


Mike Shaw
53º 21' N 3º02' W
www.wiz.to/sundials 


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Beware.

[jmikeshaw]

Tony Moss is on holiday in Greece and has had his iPad stolen.
As it contains a list of his contacts, he wants me to make everyone aware that 
the thief may use them to send out scam emails. 
So, beware of requests purporting to come from him asking for money.
He has everything he needs to get back home.

Mike Shaw
53º 21' N 3º02' W
www.wiz.to/sundials

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Re: leap year

[jmikeshaw]

My understanding is that:

If your birthday this year is a Monday, then next year it will be on a 
Tuesday, then on a Wednesday and so on - unless we have an extra day in the 
year, in which case it leaps a day.  Hence leap year.

Of course, you birthday has to be after February 


Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials



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Re: Poetry in the New York Times

[jmikeshaw]

I don’t think I’ll be buying his book – but then, I’m a Philistine.

Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials


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Re: BSS Bulletin

[jmikeshaw]

Steve,

Each week they do a quote from some obscure publication with a few words 
blocked out for the teams to guess what the missing words are.
This week they used the BSS Bulletin.
Sadly, there doesn’t seem to be a repeat scheduled, but you should be able to 
see it in BBC iPlayer.
It’s the one with Kirsty Young as the host.

Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials


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Fw: BSS Bulletin

[jmikeshaw]

See:

http://www.bbc.co.uk/iplayer/episode/b044j5n1/have-i-got-news-for-you-series-47-episode-8

Scroll forward to 24m 20s

Mike Shaw


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BSS Bulletin

[jmikeshaw]

Good to see the British Sundial Society’s Bulletin featured on this evening’s 
edition of “Have I got News For You” on BBC1

Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials


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Re: Design of Cards for Campbell Stokes Sunshine Recorder

[jmikeshaw]

The fireproofing is saltpetre if I remember correctly.

Mike Shaw


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Re: Design of Cards for Campbell Stokes Sunshine Recorder

[jmikeshaw]

Doug,

You’re right - my memory is failing.

See:  http://www.wikihow.com/Make-Fireproof-Paper

Mike


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Re: Sundial in BBC series

[jmikeshaw]

Yesterday (sunday) I saw the first  part of the new BBC serie The
story of measurement on BBC4.
In it was a horizontal sundial of questionabvle design. The style
foot was situated on the XII mark and the shadow was crossing many 
hourlines.

I can't imagine that BBC didn't do any serious research and used a
fancy sundial and even didn't notice that the shadows weren't
matching the hourlines.
Or did my TV having troubles? You never know in this digital era.

I've just had a look at the programme.
The design of the sundial face looks ok, the problem is that they have put 
the gnomon on the dial face the wrong way round.



Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials



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Re: sundial for a blind person

[jmikeshaw]

I have a vague memory of one being shown at the NASS Conference in Vancouver 
back in 2006.
I think it was called a “Light concentrating sundial” and was made by Chuck 
Nafziger.
Or am I imagining it?

Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials




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Man Wants heliochronometer

[jmikeshaw]

John,
He wants a sundial that can tell the time to “THE SECOND”.
He’ll be lucky!
Does he realise that the difference per second will be 0.0042 of a degree.
So you will be marking out the 24 hour time scale into 86,400 divisions. 

I have quite a few heliochronometers and the best one I have (that is still 
available) is a Gunning.
Despite the claims, I think the Pilkington Gibbs heliochronometer is only 
accurate to 2 minutes, - it is only marked in 2 minute divisions and the cam is 
probably worn after 100 years!
The PG Sol is marked to 1 minute and probably can (just) if you can find one. 
We think only about 50 were ever made, and I only know of 9 – do let me know if 
you have one.
My Aten is an early one that doesn’t have the later vernier scale.
I have a Silas Higgon (Bernhard type), but that’s only marked in 5 minute 
divisions. 
My Schmoyer Sunquest is a nice instrument, but is really a compromise 
heliochronometer. 

The Gunning IS accurate to a minute – you can’t really see the divisions 
smaller than that.
That said, you really do have to know what you are doing to set it up: 
accurately orientated – flat and level in all directions and set to exactly the 
correct latitude.
I found that the latitude scale as manufactured wasn’t accurate enough. 

Mike Shaw
53º 22' North 03º 02' West
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Re: equation of time sundial

[jmikeshaw]

Ken,

You wrote:
I take it the motor is to keep the hole pointed toward the sun.
It’s to keep the cylinder pointed in the direction that the sun would be if it 
kept standard time.
I should have added that this device includes the longitude correction as well.

I'm unclear though on what's drawn inside. Is it a single curve of EOT as a 
function of declination, or a family of curves?
It’s a very simple straight line grid with the vertical lines showing minutes 
from standard time and the horizontal lines showing the sun’s declination from 
the equinox position.

I hope that’s clearer.

I’ll see if I can find any photos and contact you off list.

Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials






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Re: equation of time sundial

[jmikeshaw]

Ken,

I’ve found a couple of small photos of my rather crude device.
I’ve posted then in Dropbox at :
https://www.dropbox.com/sh/tkxqw7x5mbr1axd/tYOlNAwT60

By coincidence, the 2nd photo shows the EoT is –7.5 minutes and sun’s 
declination is –7.5 degrees.

I hope that makes things clearer.

Of course, it’s just really a reverse engineered heliochronometer where you 
drive the alidade round using a 24 hour clock mechanism (widely available), to 
keep the spot of light on the analemma.
However, I’ve used a graph of EoT and declination instead so that you can read 
off the two figures directly.
Over the course of a year, the spot of light will trace out the analemma.


Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials





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Re: equation of time sundial

[jmikeshaw]

Ken,

I think I made a device some time ago to do what you want .

A cylinder was tilted to the appropriate latitude angle and direction.
There was a small hole on one side of the cylinder which gave a projected a 
spot of light from the sun on the inner opposite surface where there was a 
graph which showed:
left to right – the equation of time
up and down – the sun’s declination.

The cylinder was driven round using a 24 hour clock motor, so the spot of light 
remained apparently stationary except for changes in the EoT and sun’s 
declination that were read directly from the graph.

Sadly, I don’t think I have it any more.

Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials



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Re: Interesting sundial

[jmikeshaw]

I’ve always thought that the “summer” side of dials like this should show 
daylight saving time.
Unfortunately, the authorities refuse to change the clocks at each equinox, so 
there would be some offset.

BTW, I have one of these “Tony Moss equatorials” and mine is adjustable for 
latitude, but not longitude as someone suggested.


Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials


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Antiques Roadshow

[jmikeshaw]

Thanks for your kind comments about my Pilkington  Gibbs’ appearance on the 
Antiques Roadshow recently.
My apologies to all for the slip of the tongue when I said “day” instead of 
“year” when talking about the sun’s variation – it’s all too easy to get 
flustered when you are in extremely unfamiliar surroundings.

I did spend quite some time on the day trying to persuade the BBC that a 
programme about sundials would have universal interest, after all, they could 
have ready access to the world’s experts via this list.
Sadly, they have not been beating a path to my door – well, not yet anyway.

Incidentally, they managed to make two shows from their visit to our village, 
and my wife will be on next Sunday’s programme – she will be the one with the 
very large Imari plate.

I have subsequently had an approach from someone who owns an “unknown” Sol 
Horometer.
It is local to me, so I am going to have a look at it later today.

Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials


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PG Heliochronometers

[jmikeshaw]

For those of you who have access to UK television, I have it on good authority 
that two Pilkington  Gibbs heliochronometers will be shown on the Antiques 
Roadshow on BBC1 and BBC1HD at 20:30 next Sunday, 14th October.

Mike Shaw
53º 22' North 03º 02' West
www.wiz.to/sundials




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