> Fun! What piece of equipment is that Isotemp OCXO (page 28) used in? Scott, it's from a Trak 8812 GPS Station Clock (an early GPSDO).
> I must say the drip clock was very nice. > Re the mains frequency, I believe it changes with the load on the grid. > Do you have a record of this? Sylvain, see: http://www.leapsecond.com/pages/mains/ > Very nice, it reminded me of a NYT article about a year ago that > describes "the long zoom" as one of the defining aspects of this generation: Jeff, thanks for the pointer to that one. > I think in your Powers of Ten you showed a timepiece for which I don't > remember > any data. Since it's shown on the last page does that mean the hour glass > has > very good specs? Brooke, I did take "time interval" data on the hour glass but it was too awkward to manually get enough for a nice adev plot so I left it out of the talk. I also checked its tempco (room temperature vs. running in the 'fridge). What I need is someone to build an optically sensed auto-flipper for an hourglass. Then not only could a PC collect interval data unattended, but I'd get about 24 clean samples per day, for weeks or months at a time. I suspect a frequency drift would show up if left running long enough. /tvb _______________________________________________ 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.