[time-nuts] The pendulum problem...

mike cook michael.cook at sfr.fr
Fri Jan 31 04:33:22 EST 2014


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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