[time-nuts] Question on crystal jumps

[Neville Michie]

Hi,
In : Accurate Clock Pendulums by Robert Matthys (2004) Oxford  
University Press ISBN 0198529716, Pp264
In Chapter 8 , "The Allen variance and the rms time error", on page 38
he writes:
Figure 8.1 shows another characteristic of pendulum clocks - the  
clock will run relatively
smoothly at one rate , and then after 3 - 6 months it will suddenly  
jump to a new rate
as shown if Fig 8.1.

He goes on to say that this is part of a random walk process.

I hope that is of some help.
Neville MIchie

On 23/10/2008, at 9:34 AM, iovane@@inwind..it wrote:

> Neville,
>
>> Hi Antonio,
>>
>> precise pendulum clocks also suffer rate jumps, the process
>> of rate jumping seems to be common to most time counting
>> systems.
>
> I have an interest in this. May you point me to any references?
>
> 73,
> Antonio I8IOV
>
>
>
>
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