Hi So can you / do you actually *see* the last grain in the hourglass in question? If we are looking at something that is not observed in "normal operation" we have re-defined the function of the device.
Bob On Mar 5, 2010, at 10:50 AM, Raj wrote: > 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 >>> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.