Thanks for these links. The Harrison clocks are amazing -- I saw them at
Greenwich some years ago. The Trinity reference also amuses me as that was
my college (quite a long time ago).
Back in the 60s, my father and his cousin were competing to produce
accurate pendulum clocks with accuracies of
I have two pendulum clocks, one a 1930s-era torsional pendulum clock from
Bavaria and the other a swinging pendulum clock built around 1990. I will
follow this thread closely.
Tom, you mentioned that there are lots of resources out there - can you
elucidate?
Thanks.
DaveD
Sent from a small
You may be interested in a thread here earlier this year titled
"Absolute time accuracy pre-Cesium?" starting March 25. Also, look for
references to John Harrison in the archives. There's a video showing
several of his clocks running with the grasshopper escapement, and one
of his long clocks
Philip Gladstone wrote:
>
> The data that I get is surprising in that the pendulum swing varies
> according to the position of the hands on the clock.
Clocks with large outdoor faces have extra problems along those lines...
http://trin-hosts.trin.cam.ac.uk/clock/main.php?menu_option=pigeons
Heck as much as I like clocks I just want to see Adrians working HP 9815
calculator.
Other comment for me at least is a good clock is a marvel by itself. Adding
electronics removes the amazing engineering that went into the clock. By
good I mean clocks few of us can afford.
Though on time-nuts I
You are not the first to try this. The usual method for timing mechanical
clocks is either acoustic (a microphone picks up the sound of the escapement)
or optical (a sensor is blocked from light by the pendulum). The optical method
is more accurate but more cumbersome to setup.
Matthew
Sent
Whenever Dollar Tree those solar cell powered "nodding" figurines on sale (for
$1) I pick one up (btw, they haven't had any for several months).
A friend of mine loaned me his 16 channel 10 ns FPGA based time stamping
counter. So, I picked out 16 different nodders (out of 100 or so unique
Somewhere, a few years ago, I saw a video in which a fairly large number of
metronomes
were mounted on a common base and exhibited some interesting injection
locking
behavior.
Personally I keep thinking of phase locking a G'father clock to a Rb
standard. The trick
will be to do so in a manner
On Wed 2019-11-20T16:51:00-0900 Bill Beam hath writ:
> Most people interested in this problem have been dead for about 200 years.
Au contraire. The BIH started operations early in the 1920s and those
volumes of BIH Bulletin Horaire are scanned online. The first 20
years relied largely on
On 11/20/19 5:51 PM, Bill Beam wrote:
On Tue, 19 Nov 2019 20:10:14 -0500, Philip Gladstone wrote:
I've started to monitor the individual ticks on a grandfather clock from
the 1790s. Essentially I timestamp whenever the pendulum breaks/restores a
light beam.
The data that I get is surprising
On Thu, Nov 21, 2019 at 2:01 AM Bill Beam wrote:
> Most people interested in this problem have been dead for about 200 years.
>
> I knew there was a reason why I didn't feel so well lately ..
I have an electric pendulum clock by Bulle. A coil swings in a short arc,
following a curved magnetic
On Tue, 19 Nov 2019 20:10:14 -0500, Philip Gladstone wrote:
>I've started to monitor the individual ticks on a grandfather clock from
>the 1790s. Essentially I timestamp whenever the pendulum breaks/restores a
>light beam.
>The data that I get is surprising in that the pendulum swing varies
Hi Philip,
For low rate measurements like a pendulum clock the timestamping method
works well. A number of us do it that way. The same method works for
GPS/1PPS-like signals and also mains (raw 50/60, or divided down to 1) Hz.
Correct, if your measurements are precise enough, you should see
I've started to monitor the individual ticks on a grandfather clock from
the 1790s. Essentially I timestamp whenever the pendulum breaks/restores a
light beam.
The data that I get is surprising in that the pendulum swing varies
according to the position of the hands on the clock. It appears that
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