[time-nuts] Non electrical time-nuttery

[Neville Michie]

The reason that I remember a hard vacuum is not used is because
the low pressure is used to rate the pendulum (fine tune) by slightly  
increasing or decreasing,
and in a hard vacuum metals tend to weld together and oils evaporate  
so the mechanical bits seize
up.

cheers, Neville Michie



On 12/01/2010, at 2:04 PM, Hal Murray wrote:

>
> djl at montana.com said:
>> 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;
>
> Why do I need damping?
>
> I thought the general idea on oscillators was to get the highest Q  
> (lowest
> damping) that was reasonable.  But now that I think about it, I'm  
> not sure
> why.
>
>
> -- 
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
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