It does have the electromagnet as shorbus suggested as seen from this page on their website. It's designed to operate pendulums up to 41" and 8 oz.
SG
https://www.clockparts.com/info/inst/phdpd.jpg
SG
https://www.clockparts.com/info/inst/phdpd.jpg
That is the same one I found. Look at #5.It does have the electromagnet as shorbus suggested as seen from this page on their website. It's designed to operate pendulums up to 41" and 8 oz.
SG
https://www.clockparts.com/info/inst/phdpd.jpg
Increasing the bob weight will increase the period of oscillation, which does not sound like what he wants to do. He just wants to decrease the amplitude of oscillation (which has very little impact on the period).Another option to reduce the swing amplitude would be to increase the pendulum bob weight.
Are you sure about that? I thought weight was unrelated to period. Online calculators I've looked at don't include weight. Here's one example:Increasing the bob weight will increase the period of oscillation, which does not sound like what he wants to do. He just wants to decrease the amplitude of oscillation (which has very little impact on the period).
I was about to say this as well. However, I'm not sure that's the case. The reason why I refrained from this comment is because the weight may not be as important as the length of the bob. The longer the arm the slower the swing (longer the period). I think! Not certain though.Increasing the bob weight will increase the period of oscillation
For a "simple pendulum" this is true. But there are a lot of simplifying assumptions that are required to treat something as a simple pendulum - specifically that it consist of a point mass located at the end of a rigid, massless rod. That is clearly not the case for the pendulum in those movements the TS has linked. If you add mass, you are almost certainly going to change the location from the pivot to the center of gravity, and that it is the single dominant term in the period.Are you sure about that? I thought weight was unrelated to period. Online calculators I've looked at don't include weight. Here's one example:
https://www.omnicalculator.com/physics/simple-pendulum#how-to-analyze-a-pendulum-in-swing
Interesting points - thanks for clarifying!For a "simple pendulum" this is true. But there are a lot of simplifying assumptions that are required to treat something as a simple pendulum - specifically that it consist of a point mass located at the end of a rigid, massless rod. That is clearly not the case for the pendulum in those movements the TS has linked. If you add mass, you are almost certainly going to change the location from the pivot to the center of gravity, and that it is the single dominant term in the period.
It shouldn't affect the period much; but even if it did, does that matter? The pendulum is only decoration and isn't controlling the timing of the clock.Increasing the bob weight will increase the period of oscillation, which does not sound like what he wants to do.
I didn't catch that it was only for decoration. I thought it was so that you didn't have to wind up a main spring to power the pendulum. If it's just for decoration, then it doesn't matter as long as it's in the ballpark so that it "feels" right.It shouldn't affect the period much; but even if it did, does that matter? The pendulum is only decoration and isn't controlling the timing of the clock.
I think to a first order that's correct. The physics of a pendulum are actually very complex and, even in the case of a simple pendulum, mass does have an affect as a higher order term that can become noticeable once you have amplitudes that can no longer be considered "small".Interesting points - thanks for clarifying!
So, hypothetically it might be possible to reduce amplitude, without changing period, by adding mass at the exact same distance as the existing center of gravity... just as a theoretical exercise.
I would assume air resistance would be a small part of that.The physics of a pendulum are actually very complex and, even in the case of a simple pendulum, mass does have an affect as a higher order term that can become noticeable once you have amplitudes that can no longer be considered "small".
Sure. And friction in the components. But both of those are usually well under the affect of a change in mass, particularly if it moves the center of gravity.I would assume air resistance would be a small part of that.
I think the discussion has become theoretical. I would guess that any one to the theorizing parties would immediately follow the suggestions of the manufacturer, though to be honest, I don't really understand how tape would reduce magnetic fields, but I would certainly try it. The idea, that field strength reduction would do the trick, is enough. The problem would be solved one way or another.Still don't understand why no one wants to follow what the manufacturer of the device says?
I don't know why you think no one wants to follow what the manufacturer of the device says.Still don't understand why no one wants to follow what the manufacturer of the device says?
And Some one else found and showed it in post # 14 and #22. Smart guy.I don't know why you think no one wants to follow what the manufacturer of the device says.
In fact, I seem to recall someone very explicitly recommending that the TS look up what the manufacturer of the device has to say back in, oh, Post #6 or so.
Agreed. And since you clearly knew this, it begs the question even more why you would then claim that no one wants to follow what the manufacturer of the device says.And Some one else found and showed it in post # 14 and #22. Smart guy.
My parents had a wind up clock with a pendulum. I can still hear it clicking twice per second. On the bottom of the pendulum was a screw jack that you could move the weight up and down to accommodate for making adjustments to keep the clock at the right time.I would assume air resistance would be a small part of that.
You win. Your much smarter than me. Satisfied?Agreed. And since you clearly knew this, it begs the question even more why you would then claim that no one wants to follow what the manufacturer of the device says.
by Jake Hertz
by Duane Benson
by Duane Benson
by Duane Benson