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  1. G

    Self-built Harrison-style wooden grasshopper clock

    Hi Moritz I read your blog with the help of Google Translate. It is a fascinating read and I think it is worthy of an edition of the NAWCC Bulletin. I don't speak German and therefore can't register on your other blog so I will comment here. I am intrigued with your novel mechanism for...
  2. G

    How to synchronise a pendulum clock

    Peter You asked if I see a 1% or 2% change in time from one pendulum swing to the next and the quick answer to that is no. If I see changes of that order I start looking for sticky bearings or teeth that are not meshed and go and find them. I get fluctuation but it is an order of magnitude...
  3. G

    How to synchronise a pendulum clock

    Sensing the time of arrival of a pendulum near the end of its swing is always going to be a bit erratic as it is moving much slower. Much better to measure mid swing to get a more vertical change in sensor input.
  4. G

    How to synchronise a pendulum clock

    In my case I am using a open air coil to pulse a disk magnet. This forms a magnetic circuit (i.e. the coil is an electromagnet of certain dimensions interacting with a fixed magnet of certain dimensions) and the combination of the two needs to be considered. The more efficient this circuit is...
  5. G

    How to synchronise a pendulum clock

    That graph looks pretty much what I get when I monitor my hand cut wooden clocks. The shape of each tooth in each gear will fundamentally change the amplitude and therefore time of each pendulum swing. Also your measurement should measure each alternate beat as it is impossible to place a sensor...
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