[time-nuts] Non electrical time-nuttery

Don Latham djl at montana.com
Tue Jan 12 02:00:22 UTC 2010


Also, according to some info I read on pendulum clocks, vacuum does not
work because some viscous drag is needed to damp the free pendulum;
reduced pressure is good, vacuum bad...
(dampening, btw, is for laundry)
Don L

Neville Michie
> The clock is not actually driven by light, which has a very small
> momentum,
> but by molecular kinetic energy. The mica sheets are heated on one
> side by radiant energy
> while their other side stays cool. The thin air in the vessel has a
> larger than normal
> molecular mean free path length. All molecules are vibrating with
> Brownian motion,
> when an air molecule impinges on a hot side of the mica
> it picks up some kinetic energy, more than if it hit the cool side.
> This is enough to give a small thrust.
> If you pump the tube down to a hard vacuum then the effect stops.
> It still is an interesting clock, but a magnetic field or an
> electrostatic field could also
> be used to maintain the pendulum.
>
> cheers, Neville Michie
>
>
> On 12/01/2010, at 8:36 AM, Bill S wrote:
>
>> There is actually an "optically pumped" pendulum clock that was
>> designed by Betrisy called the Chronolith. Conceptually really
>> interesting. You can see it on his website: http://www.betrisey.ch/
>> echronolit.htm
>>
>> Bill S
>>
>>
>> J. Forster wrote:
>>> Maybe you could "pump" the pendulum optically, using a beam of
>>> light, like
>>> those glass bulb "radiometers" they sell that spin on a sunny window
>>> ledge.
>>>
>>> -John
>>>
>>> =============
>>>
>>>
>>>
>>>
>>
>>
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-- 
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
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