Other Timeballs that I know are
Another for the list, some of you will have visited Edinburgh which has
run a time gun and ball since the 1860s. I'll spare you the usual links,
the foot of this link shows the time gun correction maps that the
Edinburgh time nut of the 1860s would would
Thanks to all for the very pleasant replies.
Antonio I8IOV
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To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Setting clocks 100 years ago
OK Bob,
I'LL bite ! Why is it 1:00 pm for the ball ?
BillWB6BNQ
Bob Marinelli wrote:
Hi Murray,
Actually, the ball at Greenwich drops at 1:00 pm every day. For
everyone who can
When did clocks get good enough to notice the analemma?
li...@rtty.us said:
My guess would be the 1600's. They certainly had everything they would need
before 1620.
What happened in 1620 to indicate that people could measure the analemma?
One way to discover the analemma is to have a good
-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of WB6BNQ
Sent: 05 November 2010 12:11 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Setting clocks 100 years ago
OK Bob,
I'LL bite ! Why is it 1:00 pm for the ball
The variation of solar time was obvious from the time from star
observations.
Harrison used to line up a scratch on his window with a star
disappearing behind a
distant roof top to get consistent time intervals when he was
adjusting the
temperature compensation of his clocks and observing
if you're ever out this way.
DaveB, NZ
- Original Message -
From: Murray Greenman murray.green...@rakon.com
To: time-nuts@febo.com
Sent: Friday, November 05, 2010 12:30 PM
Subject: [time-nuts] Setting clocks 100 years ago
Navigators used chronometers to determine their longitude
: Friday, November 05, 2010 11:37 AM
Subject: Re: [time-nuts] Setting clocks 100 years ago
Another existing sample of a time ball station close to home (for me) is
here in Lyttelton near Christchurch, NZ (quake city)
http://www.teara.govt.nz/en/timekeeping/2/3
It too suffered some building damage
Hal Murray wrote:
When did clocks get good enough to notice the analemma?
li...@rtty.us said:
My guess would be the 1600's. They certainly had everything they would need
before 1620.
What happened in 1620 to indicate that people could measure the analemma?
One way to discover the
I remember the ball dropping at Greenwich at noon GMT, but that's
because it was summer, and 1 PM BST. Makes you wonder how they
interpolated the hour after the noon transit. Chronometers must
have been pretty good by then, or there would have been no
point to generating a time signal.
The US
: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bill Hawkins
Sent: Friday, November 05, 2010 11:00 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Setting clocks 100 years ago
I remember the ball dropping at Greenwich at noon GMT
This evening I happened to hear the nearby church's bell tolling 10 pm, and
thought
that 100+ years ago this could have been the official time of the town,
which
maybe was used by people to set their own clocks (if any). But then I
wondered,
who told the priest what time was it? To what
My impression is that before the Railways and Telegraph, each town had
time, based on local solar time, determined by a a noon sight or something
similar. That means that towns kept time based on their longditude.
Until the railways went long distances, Standard Time and Time Zones were
not
Hi
The simple answer is that depends. One big driver for putting up a clock
tower in the middle of town was to indeed have one standard that the town
could run on. Without that - everybody is on their own.
The main clock was often regulated by a simple sundial sitting someplace
convenient.
In major ports, which were often protected by forts, there was often a
noon gun.
In fact there is a joke/math olympics question about the soldier who fired
the noon gun, setting his watch every morning by a jewelers clock. The
jeweler set his clock every day by the fort's noon gun.
-John
I suspect that if your town was prosperous enough you had a noon sight setup
that gave you a bit better accuracy than the sun dial.
When did clocks get good enough to notice the analemma?
--
These are my opinions, not necessarily my employer's. I hate spam.
Navigators used chronometers to determine their longitude. If they were
stopped in one place long enough, they could work out longitude by a
complicated process of star and lunar observations; however, when they
left an established port, they usually took with them a time standard
based on local
Hi
My guess would be the 1600's. They certainly had everything they would need
before 1620.
Bob
On Nov 4, 2010, at 7:49 PM, Hal Murray wrote:
I suspect that if your town was prosperous enough you had a noon sight setup
that gave you a bit better accuracy than the sun dial.
When did
Sun dials easily give you time to about 2 minutes. You have to apply
the equation of time
but that its often given on the sun dial.
A reasonable long case clock would maintain a minute a week, so you
would need a lot of cloudy weather
to seriously lose track of time.
There was not a need of
Hi Murray,
Actually, the ball at Greenwich drops at 1:00 pm every day. For
everyone who can get to London, the observatory is well worth at least
a half day visit, they have several working Harrison clocks and yes
you can set your wristwatch at 1:00 when the ball drops :) there is
also
OK Bob,
I'LL bite ! Why is it 1:00 pm for the ball ?
BillWB6BNQ
Bob Marinelli wrote:
Hi Murray,
Actually, the ball at Greenwich drops at 1:00 pm every day. For
everyone who can get to London, the observatory is well worth at least
a half day visit, they have several working
Lady by David Rooney
ISBN 978-0-948065-97-2
www.nmm.ac.uk/publishing
- Original Message -
From: iov...@inwind.it
To: time-nuts@febo.com
Sent: Thursday, November 04, 2010 9:47 PM
Subject: [time-nuts] Setting clocks 100 years ago
This evening I happened to hear the nearby church's bell
Subject: Re: [time-nuts] Setting clocks 100 years ago
OK Bob,
I'LL bite ! Why is it 1:00 pm for the ball ?
BillWB6BNQ
Bob Marinelli wrote:
Hi Murray,
Actually, the ball at Greenwich drops at 1:00 pm every day. For
everyone who can get to London, the observatory is well worth
[mailto:time-nuts-boun...@febo.com] On
Behalf Of iov...@inwind.it
Sent: Thursday, November 04, 2010 4:47 PM
To: time-nuts@febo.com
Subject: [time-nuts] Setting clocks 100 years ago
This evening I happened to hear the nearby church's bell tolling 10 pm, and
thought
that 100+ years ago this could have
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