On Thu, 13 Jun 2002, John Carmichael wrote:
This is embarrassing, but I've just repeated the pinhole experiment with the
setting sun which is about 15 degrees high and I must conclude that the
results of my earlier test that I did at noon were flawed. At noon I had
tried to hold the pinhole
It will work as long as it has a power supply!
You can set the times below for recording and for the interval between
recordings.
Recording time can be 0.5seconds, 1sec, 1.5sec or 2sec.
Interval time 30sec, 1min, 5min or 10min.
For our purposes I think 0.5sec every 5minutes would be good for a 87
Tony
Yes please for some pdfs when you are sending them out (I didn't seem to get
your offer of some weeks ago?) - I am down to give a member's short talk to
the Southern Section of Antiquarian Horological Soc in September and might
find some of your images useful there, especially of the
Tony,
I would like a copy please. (GIF and PDF)
Thank you,
Bobby Whetstine
-Original Message-
From: Tony Moss [mailto:[EMAIL PROTECTED]
Sent: Friday, June 14, 2002 5:42 AM
To: Sundial Mail List
Subject: Re: seminar
Greg,
I have to conduct a 15-30 minute workshop on horizontal
Message text written by INTERNET:sundial@rrz.uni-koeln.de
Perhaps the only way to get a truly 'burr-free' and 'surrounding
depression free' hole is to chemically etch it.
Not sure this message of mine is really relevant to those making shadow
sharpeners where the hole size might need to be
Greg,
I have to conduct a 15-30 minute workshop on horizontal sundials. Real basic
stuff, how to use the sun to tell time, how to make and position a simple
horizontal dial, etc.. Has anyone ever had to give such a talk and if so
what type of preparation, materials, handouts, slides, etc...
Dave Bell wrote:
One important consideration here is to make the pinhole in as thin as
possible a sheet of material. Foil stretched over a hoop would work well,
and be easy to punch. Pinhole camera buffs make a point (heh!) of drilling
a hole, using a sharp needle, with a backup block of plastic
Sundialists
I want to ask a simple question to sundialists in the ML.
Why the clock rotates clockwise? Most Japanese horologist says as
follows. In the very old times, primitive people knew the rough time from
the sun-shadow of the vertical gnomon on the ground. In that case, the
shadow of the
tony,
The 3D model sounds like something I've been mulling over for years. Please
send me a copy too.
Cheers,
++ron
- Original Message -
From: Tony Moss [EMAIL PROTECTED]
To: Sundial Mail List sundial@rrz.uni-koeln.de
Sent: Friday, June 14, 2002 2:41 AM
Subject: Re: seminar
On Fri, 14 Jun 2002, Tony Moss wrote:
Dave Bell wrote:
One important consideration here is to make the pinhole in as thin as
possible a sheet of material. Foil stretched over a hoop would work well,
and be easy to punch. Pinhole camera buffs make a point (heh!) of drilling
a hole, using a
I'm a newcomer to the group (and computers-Hope I
press the right buttons!
A recent Radio 3 prog gave details of a proposed 40
metre high, £350,000 "Solar driven Timepiece" to be erected near Chesterfield,
U.K. A project spokesman said it would open at the "Summer Equinox", midsummer
day,
There is an article in the NY Times today (Page
B38 in my edition) about Seth Atwood and the (now defunct) Time Museum. According to the article, Mr. Atwood is now
going back to Sotheby's. He is selling an additional 218 pieces from his
collection on Wednesday, in an auction titled
In the very old times, primitive people knew the rough time from
the sun-shadow of the vertical gnomon on the ground. In that case, the
shadow of the gnomon rotates clockwise on the north hemisphere, so the
clockwise-rotating mechanical clock was made. This is right?
I think so - because all the
Please send me a copy as well. Sincerely,
Ronit Maoz
- Original Message -
From: Tony Moss [EMAIL PROTECTED]
To: Sundial Mail List sundial@rrz.uni-koeln.de
Sent: Friday, June 14, 2002 11:41 AM
Subject: Re: seminar
Greg,
I have to conduct a 15-30 minute workshop on horizontal
At least one early mechanical clock did rotate once every 24 hours.
See Wells cathedral clock!
Peter RansomMSN Photos is the easiest way to share and print your photos: Click Here
-
Earlier water clocks (those at Karnak and Edfu in Egypt, for example) had
scales of twelve hours. Thus, one had sundials and night clocks, both with
twelve-hour dials. With twelve hours each for the day and night, it would
seem reasonable to have a twelve-hour dial on a mechanical clock.
It's often claimed that the fore-runners of mechanical clocks were physical
models of the heavenly sphere(s). In the northern hemisphere this/these
appeared to rotate clockwise. So clocks followed suit.
John Lynes
- Original Message -
From: Sumi Yoichi [EMAIL PROTECTED]
To:
Tony,
Please send me a copy also.
Thanks,
Hal
On 14 June Tom Kreyche wrote:
There is an article in the NY Times today (Page B38 in my edition)
about Seth Atwood and the (now defunct) Time Museum. According to the
article, Mr. Atwood is
now going back to Sotheby's. He is selling an
additional 218 pieces from his collection on Wednesday, in
Tony you were kind enough to forward some picts some time in the past. At
that time I talk about a design I was working on this is the dial, what do
you think?
Dave Scott
http://dscott.home.igc.org/
-
Title: Re: Time Museum Auction
Dear Tom and other dialing enthusiasts,
I'm sorry to report that, in fact, there will be a second
Sotheby's auction (this fall) at which many of the Atwood collection's
lovely dials and instruments of interest to this group will be offered
for sale.
Best wishes,
Please, let me be a little bit pedantic... ;-))
Sundialists know well the shadow of the gnomon of the vertical type sundial
on the wall rotates anticlockwise.
Well, this is true only if the wall's declination is lower than +/- 90
deg. If the wall looks, so to say, NorthEast or
NorthWest
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