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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Clockmaker John Harrison vindicated
From: Hanno Ix
Date: 2015 Apr 20, 13:08 -0700
Up to the mid 60's the University of Stuttgart / Dept. of Horology and Micro mechanisms
provided time signals for the local radio station and industry - and their reference was
a pendulum clock just as Geoffry described. It had a ~1m pendulum and an amplitude
They found that a major contribution to its accuracy and stability was the wall to
which the clock was attached. It needed to be detached from the building altogether.
So this clock was located in the basement of the institution and hung from the side
of a big block of concrete, perhaps 1m * 1m* 3m, which had its own foundation in the ground.
From: Hanno Ix
Date: 2015 Apr 20, 13:08 -0700
These remarks refer to precision pendulum clocks and their development in Germany
in 1800's.
Up to the mid 60's the University of Stuttgart / Dept. of Horology and Micro mechanisms
of about 3 deg. I don't remember the specified accuracy.
So this clock was located in the basement of the institution and hung from the side
of a big block of concrete, perhaps 1m * 1m* 3m, which had its own foundation in the ground.
There is more detail here on such clocks:
http://en.wikipedia.org/wiki/Sigmund_Riefler
http://www.brown.edu/Departments/Physics/Ladd/instruments/riefler.html
http://en.wikipedia.org/wiki/Sigmund_Riefler
http://www.brown.edu/Departments/Physics/Ladd/instruments/riefler.html
Another researcher/inventor was Schuler of the Schuler-pendulum-fame whose
ideas are still implemented in modern inertial navgation systems.
NASA published the attached article about his electrically driven precision
pendulum clock - in German :( I add this for the benefit of the German speaking
members of the list.
H
On Mon, Apr 20, 2015 at 3:31 AM, Geoffrey Kolbe <NoReply_GeoffreyKolbe@fer3.com> wrote:
On Mon, Apr 20, 2015 at 7:01 AM, Bill Morris <NoReply_Morris@fer3.com> wrote:
I agree with Geoffrey that if the clock was sealed hermetically in a case it would have been isolated from changes in atmospheric pressure, and I wonder how then the clock was wound.
This gives a good description of the Burgess B clock
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