[time-nuts] New +/- 1 sec in 100 days mech clock

Don Latham djl at montana.com
Tue Apr 21 14:14:30 EDT 2015

I saw Harrison's number one (its replica?) at Greenwich some time ago. It is a
dual pendulum, 180 out of phase. I remember a lot of springs.

Peter Torry
> You could always use the traditional method of piercing saw and files.
> Thinking about it I suppose files were the original milling machine.  Be
> aware that the horological approach is different from the engineering
> approach and there are numerous traps waiting for the unwary.  Harrison
> and Martin's clock B have remarkable performance but could still be
> improved by using multiple pendulums to overcome the noise effects for
> example a two pendulum clock is performing within 1 second in six months
> (so far) so I will have to get the hacksaw out for the three pendulum
> version - or is it back to the GPSDO.
> Peter
> On 20/04/2015 20:51, Attila Kinali wrote:
>> On Mon, 20 Apr 2015 09:59:06 +0200
>> Attila Kinali <attila at kinali.ch> wrote:
>>>> Mechanical, yes. Home brew, no. It is an absolutely stunning clock,
>>>> both in beauty and performance.
>>> Given the fact that a CNC milling machine can be bought quite cheaply
>>> today, i would say that homebrew is easily possible. All you need
>>> is a good understanding on different materials and how to machine them.
>>> (This can be aquired using various machining books out there)
>> Just to make sure there is no misunderstanding. What I ment here
>> was, that once you have the plans, machining the parts and building
>> the watch is easy. Comming up with a good plan is still hard.
>> 			Attila Kinali
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"Noli sinere nothos te opprimere"

Dr. Don Latham AJ7LL
Six Mile Systems LLC
17850 Six Mile Road
Huson, MT, 59846

mail:  POBox 404
Frenchtown MT 59834-0404

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