In the last slide you show a sand timer. Do you have accuracy data for it?
Hi Brooke, The past 3 hours the "one hour" timer measures 56:24, 56:19, and 56:30. That's at 67 F room temp. Somewhere I have enough clean data to compute the ADEV; it's more stable than accurate. It also has a tempco (one day when my wife wasn't looking I collected data inside the kitchen refrigerator, and oven). I would guess it has very little dependence on barometric pressure or humidity since all the sand is sealed inside the blown glass bulb. Eventually I will mechanically automate the hourly turn-over and get 24x7 long-term data. If I also model the tempco it may be possible to temperature compensate the rate error. I don't know where the flicker floor will be. My prediction is this hour-glass will gradually speed up as the glass or the sand slowly wear over time. /tvb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
