[time-nuts] Sensing pendulum position, speed, or height
Neon John
jgd at johngsbbq.com
Fri Mar 30 00:12:01 UTC 2007
On Thu, 29 Mar 2007 15:45:25 -0700, Hal Murray
<hmurray at megapathdsl.net> wrote:
>
>How do modern pendulum clock geeks measure what their pendulum is doing? I'm
>picturing a magnet on the bottom of the pendulum and a coil or hall effect
>sensor.
Prowl around here
http://www.hsn161.com/links.html
Particularly
http://www.precisionclocks.com/
This guy's work is jaw-dropping. Fused quartz pendulum and arm, hall
effect position sensing, running the whole affair in a vacuum, having
a custom glass vacuum chamber fabricated by a scientific glass shop.
Not pendulum related but look at this guy's work.
http://www.angelfire.com/sd/rronnie/
My jaw dropped again.
John
---
John De Armond
See my website for my current email address
http://www.neon-john.com
Cleveland, Occupied TN
All great things are simple and many can be expressed in single words:
Freedom, Justice, Honor, Duty, Mercy, Hope. -Churchill
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