Phil, Does the clock have a mechanism for turning the other end of the spring to change the spring constant? H

This makes more sense, that perhaps the friction between the minute hand and some other element changes as a function of position. Could you check to see if that is the case? Then we still have to fig

This is interesting. It is not clear how this could happen. How heavy are the hands, and are they balanced? If the error arises somehow from a gravitational torque on the hands, we would expect maximu

Thanks! Harvey

Thanks. That is an interesting result you got. I am pretty unconstrained on the design, so I can surely do that. Best, Harvey

Hi All, Do any of you have any ideas or drawings for clock cases? I have a synchronome movement, but have rather casually boxed it in the past. I am thinking of moving up to a real case. Any advice/re

Hi Neil, When we needed to match the coefficient of the epoxy to the material being bonded, we would get quartz-filled versions, that match typical material coefficients near room temp. There must be

Hi All, Just a brief comment on temperature compensation of the pendulum. Since we know accurately the coefficients of expansion of the suspension, pendulum rod, and pendulum bob, you can determine ac

Has anyone used quartz as the suspension flexure? It is very strong, and if thin enough, can be kept well below the brittle fracture limit. Harvey

Very interesting. Do you have a barometer with rapid readout to see if the house is pressurizing and depressurizing. I am almost sure that is it. If it were building motion, you would expect a signifi

Good to hear about this. Question: How is Bepi doing? He is in the current epicenter of the Italian covid-19 infection, so I hope he is doing well. Harvey

Hi Bepi, Pretty interesting! One parameter to look at is temperature. The expansion coefficient of lead is significantly larger than that of iron. Presumably it was in thermal equilibrium by the time

Hi Bepi, I would guess the widely separated clocks will be uncorrelated, but if you had a nearby clock (same building, same town, same country) where atmospheric pressure and temp are correlated, you

Very nice. Beyond air density and temperature, are there any other parameters that should affect the pendulum period? Will be interesting to see the residuals after the pressure and temperature depend

Sorry Johannes, I see it was "noise" you were talking about. I am a physicist, and in the field, noise is the word used to describe any random fluctuations that affect a measurement. We spend a lot of

Johannes, What was the mystery word I was using? I will try to clarify. Best, Harvey

Hi Bepi, Very impressive and interesting results! These results raise a question; why is the mechanical impulse noisy? I was trying to make a list of possible error sources: 1) dissipation in the mech

Looks like it makes initial contact with the pallet on the curved surface. Is that correct? Harvey

It would seem to me that as it rolls off the edge of the pallet, it would provide a lateral impulse that would be undesirable. Thanks, Harvey

Hi John, Thanks for the excellent comments. Does the roller fall off the pallet before the electrical contact is made to lift the gravity arm, or while the roller is on the pallet? It seems that this