[time-nuts] The pendulum problem...
Brian, WA1ZMS
wa1zms at att.net
Fri Jan 31 07:23:41 EST 2014
Mike-
Yes, I was wrong. The idea of constant driving power was around. Sadly most of these early American tall clocks with often sand filled weights used a simple design since as you noted cost was important and raw metals such as brass was hard to produce locally and often imported from Europe.
I think the best I can do is to use the basic design from the article that David noted and will have to adjust the clock once a week after winding.
-Brian, WA1ZMS/4
iPhone
On Jan 31, 2014, at 4:33 AM, mike cook <michael.cook at sfr.fr> wrote:
>
> Le 31 janv. 2014 à 06:06, Brian, WA1ZMS a écrit :
> < snip>
>>
>> "Modern" pendulum clocks have a modified gear drive where the
>>
>> escapement is still being driven while the main wheel is being advanced
>>
>> to wind the weight cable. Not the case for 200+ year old clocks.
>>
>>
>
> It is not so much the case that it wasn't available as not always implemented . The problem, and its solution "maintaining power" had been addressed by many since Christian Huygens in the 17th C. and also John Harrison , the inventor if the marine chronometer in the mid 18th C. Similarly the principle exists for spring wound clocks, but is often omitted to keep the price down.
>
>>
>> Regards,
>>
>> -Brian, WA1ZMS/4
>>
>>
>>
>>
>>
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