[Bell Historians] French clocks.

[Bickerton, Roderic K (SELEX) (UK)]

Could there be ignorance of engineering principles?
The chime speed will be variable for a number of reasons, but not the
height of the weights.
the speed governor is usually an air fan.
its resistance is effected by air density and simple facts like whether
weather the clock case is open or closed.
Generally the fan blades are made adjustable so the chime speed can be
adjusted.
The form of adjustment usually is a friction fit of the blades on the
arms, allowing them to be turned to change the air resistance.
They can easily be changed during routine inspection if accidentally
knocked and I suspect change with time, due to the stress and vibration
generated during use.
I rather like the idea of a variable time standard as it introduces an
element of luck into who actually beats the clock.
 
 
 
 

________________________________

From: bellhistorians at yahoogroups.com
[mailto:bellhistorians at yahoogroups.com] On Behalf Of Mike Chester
Sent: 30 October 2007 15:03
To: bellhistorians at yahoogroups.com
Subject: Re: [Bell Historians] French clocks.


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--- In bellhistorians at yahoogroups.com
<mailto:bellhistorians%40yahoogroups.com> , "Bickerton, Roderic K
(SELEX) 
(UK)" <roderic.bickerton at ...> wrote:
> It is a weight driven clock so what connection between the height of 
the weights and the speed? Might I suggest it could even be faster low 
down because of the contribution from the weight of the extra deployed 
winding cable.
> 

Only repeating what is on the website 
http://www.trin.cam.ac.uk/index.php?pageid=378
<http://www.trin.cam.ac.uk/index.php?pageid=378> 

Surely Cambridge people would not tell porkies. JEC might have 
something to say on that!

Mike



 


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