The way these caps are wired does not isolate DC from the transformer. The
purpose is obviously a different one. Two reasons spring to mind:
1. If the caps are wired close to the connector, and Ground means the metal
enclosure, then the caps provide RF continuity between cable shield and
On 07/22/2010 02:13 AM, Morris Odell wrote:
The pendulum requires a sustaining system to compensate for the inevitable
energy loss with each swing. The system is located in the building and
therefore rotates relative to the pendulum. It needs to provide an impulse
which does not affect the
The Exploratorium at The Palace of Fine Arts in San Francisco had one of these,
and
may still have it. I haven't been there in a while and don't know the details.
Nuts Volts had a construction project for a continuously swinging pendulum in
their
September 2009 issue. It had a magnet at the
Hi
Efratom and Datum are the same company. The LPRO is a staple on the e-place.
The other common alternatives are Frequency Electronics, Symmetricom, and
Tecelek (that's not the right spelling ...).
I would stick with the LPRO since it's the cheapest of the bunch. They all
perform pretty
On 07/22/2010 01:58 PM, Bob Camp wrote:
Hi
Efratom and Datum are the same company. The LPRO is a staple on the e-place.
The other common alternatives are Frequency Electronics, Symmetricom, and
Tecelek (that's not the right spelling ...).
Tekelec/Temex/Spectratime
On Wed, Jul 21, 2010 at 10:40:48PM -0400, Bob Bownes wrote:
Silly me, I just realized you need to compensate for the change in
length with temperature.
You could use an Invar wire.
This sounds like a great project!
On Wed, Jul 21, 2010 at 10:26 PM, Bob Bownes bow...@gmail.com wrote:
On Wed, Jul 21, 2010 at 7:57 PM, J. Forster j...@quik.com wrote:
I remember one someplace in London too.
Science Museum in South Kensington, I'd expect, but I've not been there
20+ years.
Yes, they have one in one of their open multi-storey stairwells. If I
remember correctly, the energy
http://www.astro.louisville.edu/foucault/pendulum.pdf is one of the best
references I have in my bookmarks.
Matthew Kaufman
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Just tried to invoice the ones not paid yet but paypal doesn't allow enough
time
for me to complete the invoice and thinks it is OK to dump my work up to that
point, note to self sell ebay stock short and use money to hire someone to do
paperwork.
The people in the EU / UK I wanted to ship at
Hi Morris:
See:
http://www.calacademy.org/products/pendulum/pendulum_sales.html
http://www.calacademy.org/products/pendulum/pendspec.pdf
they are not cheap, but a proven design and probably lower in cost than
making just one of them.
One of these was working at Foothill College in Los Altos
Brent,
aside of the small and inexpensive module boxes, how 'bout a HP 5065A or
a Rohde Schwarz XSRM?
Both provide a lot more fun :)
Adrian
Brent Gordon schrieb:
I'm considering buying a rubidium standard, not that I really need
one, just because I'm a Time Nut. I have some questions on
Eugen Leitl wrote:
On Wed, Jul 21, 2010 at 10:40:48PM -0400, Bob Bownes wrote:
Silly me, I just realized you need to compensate for the change in
length with temperature.
You could use an Invar wire.
Some insight from a friend (a proto-timenut) who was thinking about
building a 1ppm free
Jamie:
Does the main game play correctly?
Ronald
On Jul 22, 2010 8:00 AM, time-nuts-requ...@febo.com wrote:
Send time-nuts mailing list submissions to
time-nuts@febo.com
To subscribe or unsubscribe via the World Wide Web, visit
IIRC, there was a large one at Weston Observatory (Boston
College). But, it has been 40+ years since I was last there.
73, Dick, W1KSZ
-Original Message-
From: Flemming Larsen oz...@yahoo.dk
Sent: Jul 22, 2010 1:47 AM
To: Discussion of precise time and frequency measurement
One nice thing about the older Efratom standards like the FRK and M100
is that full schematics and circuit descriptions are available. They
are easy to service because they're completely analog (no processor) and
they're built with through-hole components, most of which are readily
available
Hi
If cost is no object, get one of each...
The 5065 is a very different beast than the LPRO performance (and cost)
wise. I've never played with a XSRM.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Adrian
Sent: Thursday, July
Hi
At $30K certainly not cheap. My guess is that the building modifications
and permits will set you back a pretty significant chunk of money as well.
The issue of troubleshooting a 6 story high machine in a public space (plus
insurance issues) likely makes the proven design a much better
On 07/22/2010 04:51 PM, Adrian wrote:
Brent,
aside of the small and inexpensive module boxes, how 'bout a HP 5065A or
a Rohde Schwarz XSRM?
Both provide a lot more fun :)
Talking about it... anybody has a an Allan dev plot fro the XSRM?
I have one... but I can't recall that I have seen an
On 07/22/2010 06:39 PM, Bob Camp wrote:
Hi
If cost is no object, get one of each...
The 5065 is a very different beast than the LPRO performance (and cost)
wise. I've never played with a XSRM.
The XSRM is a nice beast. First rubidium in the house. I now have three
rubidiums and a cesium
Does anyone have any documentation on these GPS modules? I've been
unable to determine anything other than Magnavox sold the line to
Leica.
They have a 20 pin header much like a Jupiter, but don't appear to be
pin compatible.
Thanks,
Bob
___
time-nuts
Hi Bob:
Like this:
http://www.prc68.com/I/MX4102.shtml#4200
Have Fun,
Brooke Clarke
http://www.PRC68.com
Bob Bownes wrote:
Does anyone have any documentation on these GPS modules? I've been
unable to determine anything other than Magnavox sold the line to
Leica.
They have a 20 pin header
Unfortunately not. This is more of a Jupiter looking module with the
classic 20 pin DIL header.
Thanks tough!
On Thu, Jul 22, 2010 at 1:22 PM, Brooke Clarke bro...@pacific.net wrote:
Hi Bob:
Like this:
http://www.prc68.com/I/MX4102.shtml#4200
Have Fun,
Brooke Clarke
http://www.PRC68.com
How about putting a high voltage, high frequency on the bob and wire, so
any body part that gets within say 2 feet draws giant arcs? :))
-John
===
Well, I thought it was interesting that a barrier was needed at least
3 feet away from the swing so that people would not grab the
Well, I thought it was interesting that a barrier was needed at least
3 feet away from the swing so that people would not grab the cable.
Can you imagine the effect of grabbing the cable with a 250 pound bob
attached?
I'd build one called Evolution in Action. Put a Poe-like blade on
the bottom
Wouldn't that affect the path of the pendulum
by interacting with the Earth's magnetic field?
:)
J. Forster wrote:
How about putting a high voltage, high frequency on the bob and wire, so
any body part that gets within say 2 feet draws giant arcs? :))
-John
The Griffith Park exhibit did include a Tesla Coil. Hm...
Don
J. Forster
How about putting a high voltage, high frequency on the bob and wire, so
any body part that gets within say 2 feet draws giant arcs? :))
-John
===
Well, I thought it was interesting that a barrier
Hi Bob,
Is this the ca 1991 GPS Engine by Magnavox? (board size approx 65 x 165 mm)
There is some documentation available in this thesis:
http://www.physics.adelaide.edu.au/~cwilkins/thesis.tar.gz
--
Björn
Unfortunately not. This is more of a Jupiter looking module with the
Sounds like it. I'll try to unroll the thesis and read it.
Thanks!
Bob
On Thu, Jul 22, 2010 at 2:27 PM, b...@lysator.liu.se wrote:
Hi Bob,
Is this the ca 1991 GPS Engine by Magnavox? (board size approx 65 x 165 mm)
There is some documentation available in this thesis:
I'm sure you're right. The Rb was a hardware option that was added
after the original design so I wasn't paying much attention. I thought
the chassis was different but may have just been longer than the stock
10.5 version? That chassis design was an experiment where we had an
industrial design
As a number of examples have been referenced in the reply to the
original post, I will add a note on one of pendulums that Foucault
himself constructed.
Foucaults original experiments used shortish cables, but Napoleon
wanted a more prestigeous affaire. It was originally installed by
Unfortunately the cable reached its sell by date on the 18th May this year
when it broke, dropping the ball on the marble floor , denting it. Most
unfortunate.
Denting the bob or the marble floor? :)
___
time-nuts mailing list -- time-nuts@febo.com
I thought that might have caused some confusion ;) . The bob, of course.
I guess it can be replaced, but it is a shame that as a historical
instrument, it could not have been better cared for. All is not lost
though, as one of his smaller original pendulums is swinging in the
Panthéon it
Hi
I assume that was Napoleon III rather than the original
(I'd hate to see the time-nuts list get banned by the French History
Police).
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of mike cook
Sent: Thursday, July 22, 2010
time-n...@kasperkp.dk said:
As a kid, I did a self sustaining pendulum with no moving parts and no
magnets:
The bob was suspended by two parallel wires, lacquered together, and
shorted at the bob end. As the bob passed over the center, a one-shot sent
a good-sized current pulse through the
Thanks. Hope the Sym are treating you well! Give my regards to Ron.
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Greg Dowd
Sent: 22 July 2010 8:10 PM
To: Discussion of precise time and frequency measurement
Subject: Re:
I also think so,
but Time-nuts are nuts about attoseconds, not decades... ;-}
Jean-Louis Oneto
- Original Message -
From: Bob Camp li...@rtty.us
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Sent: Thursday, July 22, 2010 8:03 PM
Subject: Re: [time-nuts]
Actually, I think you can find a time-nut for any span of time,
sub-nanosecond to leap seconds, to leap years, to ...
John WA4WDL
--
From: Jean-Louis Oneto jean-louis.on...@obs-azur.fr
Sent: Thursday, July 22, 2010 7:11 PM
To: Discussion of
Hmmm. I thought time-nuts were nuts about time, with branch interests
in accuracy, resolution, history...
On 7/22/2010 6:24 PM, jmfranke wrote:
Actually, I think you can find a time-nut for any span of time,
sub-nanosecond to leap seconds, to leap years, to ...
John WA4WDL
On 07/23/2010 01:54 AM, Oz-in-DFW wrote:
Hmmm. I thought time-nuts were nuts about time, with branch interests
in accuracy, resolution, history...
History is nanoseconds ago.
Recent history is picoseconds ago.
Just now is femtoseconds ago.
Fraction of mind ago is attoseconds ago.
Acient
Magnus Danielson wrote:
On 07/23/2010 01:54 AM, Oz-in-DFW wrote:
Hmmm. I thought time-nuts were nuts about time, with branch interests
in accuracy, resolution, history...
History is nanoseconds ago.
Recent history is picoseconds ago.
Just now is femtoseconds ago.
Fraction of mind ago is
Matthew,
On 07/23/2010 02:15 AM, Matthew Kaufman wrote:
Magnus Danielson wrote:
On 07/23/2010 01:54 AM, Oz-in-DFW wrote:
Hmmm. I thought time-nuts were nuts about time, with branch interests
in accuracy, resolution, history...
History is nanoseconds ago.
Recent history is picoseconds ago.
E A Foucalt Pendulum is not about time! It's about motion in
inertial space.
-John
===
Matthew,
On 07/23/2010 02:15 AM, Matthew Kaufman wrote:
Magnus Danielson wrote:
On 07/23/2010 01:54 AM, Oz-in-DFW wrote:
Hmmm. I thought time-nuts were nuts about time, with branch
Another perspective on time: http://www.longnow.org/clock/
And some fascinating mechanical stuff.
-Demian
Message: 4
Date: Fri, 23 Jul 2010 02:11:04 +0200
From: Magnus Danielson mag...@rubidium.dyndns.org
Subject: Re: [time-nuts] A different timenuts interest
To:
J. Forster wrote:
E A Foucalt Pendulum is not about time! It's about motion in
inertial space.
are they not the same, underneath it all?
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
Hi all,
I would like to thank everyone who responded to my post. This is a wonderful
group of talented and erudite people and it was a pleasure to read the posts
(and private emails) on the subject of the Foucault pendulum. Where else
could the discussion range over timekeeping, mechanical
45 matches
Mail list logo
