[time-nuts] nubie querie

Raj vu2zap at gmail.com
Fri Mar 5 15:50:50 UTC 2010


The variability will depend on friction between particles and the last particle's physical slide down the glass!

At 05-03-10, you wrote:
>Hi
>
>Even defining when the sand timer is "done" is not a real simple thing. Waiting for that very last particle to drop may not be the best approach. 
>
>Bob
>
>
>On Mar 5, 2010, at 9:20 AM, Tom Holmes, N8ZM wrote:
>
>> tvb...
>> 
>> Not to kick sand in your face, but it seems that in order for your automated
>> turn-over device to work, as well as to accurately measure the time
>> intervals, you would need a means to determine when the sand quits flowing.
>> Possibly an accelerometer or microphone, with the added benefit of being
>> able to hear the close-in phase noise.
>> 
>> I admire your dedication to monitoring the hour long periods of the sand
>> timer so diligently. Truly a time-nut!
>> 
>> Regards,
>> 
>> Tom Holmes, N8ZM
>> Tipp City, OH
>> EM79xx
>> 





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