Your 5 minutes web search has not revealed the theory
behind the gravity escapement, a form of remontoire,
a means to decouple the pendulum from the going train

The impulse to the pendulum is dependent upon two
locally invariant properties, the acceleration due to
gravity, and the mass of the Impulse Arms
(Dennison/Grimethorpe version) and pendulum.
The pendulum is not impulsed by the (weight driven
not spring driven) Going Train.

Brian Reay wrote in message
...
"Airy R. Bean" wrote in message
...
WRONG! Your comments relating to loss of accuracy are
WRONG in your assumption because I am considerng the
use of a gravity escapement.
The underlying problem is the same. Whatever the oscillating element
(balance wheel, pendulum etc) there is a problem with maintaining the
oscillation (by an impetus from the spring or weights via the drive chain)
and using energy from the oscillating element to release the escapement.
The former can be affected by spring tension (hence the use of the fusee
in
older watches, automatic winding in newer ones, and even the relative
success of the cylinder escapement) and the search over many years to
maximise the free swing portion of the oscillation (ie minimising the
energy
taken from the oscillating element to release the escapement.

"Airy R. Bean" wrote in message
...

Your 5 minutes web search has not revealed the theory
behind the gravity escapement, a form of remontoire,
a means to decouple the pendulum from the going train


One of the fundamental problems in time pieces is the decoupling of the
escapement from the oscillating element- not from the going train. The issue
is ensuring that the oscillation period is not changed by the two functions
of the escapement a) to provide the impulse b) to allow the going train to
advance at a rate controlled by the oscillator (eg the pendulum). If you
think about it, there is an analogy to Q here. In (a) I include the added
complications of ensuring an impulse largely constant despite variations in
the state of the spring (if used).

Over the years many approaches have been tried - verge, deadbeat, cylinder,
duplex, and (of course) the lever are the ones that spring to mind from my
watch repairing days. I suggest you get hold of deCarl(e)s book on the
escapement- I forget the title as it must be 25 years since I read it.

Incidently, for a 'joke' you seem to be putting in a lot of effort.

The impulse to the pendulum is dependent upon two
locally invariant properties, the acceleration due to
gravity, and the mass of the Impulse Arms
(Dennison/Grimethorpe version) and pendulum.


The pendulum is not impulsed by the (weight driven
not spring driven) Going Train.

Regardless of where the energy comes from, and this is about energy, the
fundamental issues are the same:

1. Getting energy 'into' the pendulum to maintain the oscillation.

2. Minimising the interference of the escapement on the pendulum (or other
timing element) - also an energy matter.
(This could be helped by increasing the 'swing' but that then brings into
play other errors due to pendulum length variation with temperature.)

The above is true regardless of where the energy for the impulse comes from.

"Brian Reay" wrote in message
...

One of the fundamental problems in time pieces is the decoupling of the
escapement from the oscillating element- not from the going train. The
issue
is ensuring that the oscillation period is not changed by the two
functions
of the escapement a) to provide the impulse b) to allow the going train to
advance at a rate controlled by the oscillator (eg the pendulum). If you
think about it, there is an analogy to Q here. In (a) I include the added
complications of ensuring an impulse largely constant despite variations
in
the state of the spring (if used).

Over the years many approaches have been tried - verge, deadbeat,
cylinder,
duplex, and (of course) the lever are the ones that spring to mind from my
watch repairing days. I suggest you get hold of deCarl(e)s book on the
escapement- I forget the title as it must be 25 years since I read it.

Incidently, for a 'joke' you seem to be putting in a lot of effort.

Regardless of where the energy comes from, and this is about energy, the
fundamental issues are the same:

1. Getting energy 'into' the pendulum to maintain the oscillation.

2. Minimising the interference of the escapement on the pendulum (or other
timing element) - also an energy matter.
(This could be helped by increasing the 'swing' but that then brings into
play other errors due to pendulum length variation with temperature.)

The above is true regardless of where the energy for the impulse comes
from.

Blimey, I think I'll stick to sundials, I can understand them, I suggest
Airy does the same.
--
;)
73 de Frank Turner-Smith G3VKI - mine's a pint.

"Frank Turner-Smith G3VKI" wrote in message
...

Blimey, I think I'll stick to sundials, I can understand them, I suggest
Airy does the same.

Actually, sun dials are an interesting topic in their own right. There is a
"sundial society"- not sure of the correct name but a local SK was a member
and made sundials to plans he got from them.

73

Brian

"Brian Reay" wrote in message
...
"Frank Turner-Smith G3VKI" wrote in message
...

Blimey, I think I'll stick to sundials, I can understand them, I suggest
Airy does the same.

Actually, sun dials are an interesting topic in their own right. There is
a
"sundial society"- not sure of the correct name but a local SK was a
member
and made sundials to plans he got from them.

73

Brian

I found an interesting article on the web about sundials, and one particular
manufacturer who claimed that, provided you followed their installation
instructions precisely, their sundial could be read to an accuracy of one
minute!
ISTR they calculated the rotation and tilt from your latitude / longitude.
No Summer Time correction, of course, and not much use at night, unless you
use a torch!
--
;)
73 de Frank Turner-Smith G3VKI - mine's a pint.

"Brian Reay" wrote in message
...
"Frank Turner-Smith G3VKI" wrote in message
...

Blimey, I think I'll stick to sundials, I can understand them, I suggest
Airy does the same.

Actually, sun dials are an interesting topic in their own right. There is
a
"sundial society"- not sure of the correct name but a local SK was a
member
and made sundials to plans he got from them.

73

Brian

I found an interesting article on the web about sundials, and one particular
manufacturer who claimed that, provided you followed their installation
instructions precisely, their sundial could be read to an accuracy of one
minute!
ISTR they calculated the rotation and tilt from your latitude / longitude.
No Summer Time correction, of course, and not much use at night, unless you
use a torch!
--
;)
73 de Frank Turner-Smith G3VKI - mine's a pint.

"Frank Turner-Smith G3VKI" wrote in message
...

Blimey, I think I'll stick to sundials, I can understand them, I suggest
Airy does the same.

Actually, sun dials are an interesting topic in their own right. There is a
"sundial society"- not sure of the correct name but a local SK was a member
and made sundials to plans he got from them.

73

Brian

In article , g3vki@turner-
smith.co.uk says...
| Blimey, I think I'll stick to sundials, I can understand them, I suggest
| Airy does the same.

Sundials are not quite so simple as they at first appear.

--
Regards,
Harry (M1BYT)...

Remove the 'NOSPAM' in my email address to reply.

Free Amateur Radio Courses:-
http://www.ukradioamateur.org

In article , g3vki@turner-
smith.co.uk says...
| Blimey, I think I'll stick to sundials, I can understand them, I suggest
| Airy does the same.

Sundials are not quite so simple as they at first appear.

--
Regards,
Harry (M1BYT)...

Remove the 'NOSPAM' in my email address to reply.

Free Amateur Radio Courses:-
http://www.ukradioamateur.org

"Brian Reay" wrote in message
...
"Airy R. Bean" wrote in message
...

Your 5 minutes web search has not revealed the theory
behind the gravity escapement, a form of remontoire,
a means to decouple the pendulum from the going train


One of the fundamental problems in time pieces is the decoupling of the
escapement from the oscillating element- not from the going train. The
issue
is ensuring that the oscillation period is not changed by the two
functions
of the escapement a) to provide the impulse b) to allow the going train to
advance at a rate controlled by the oscillator (eg the pendulum). If you
think about it, there is an analogy to Q here. In (a) I include the added
complications of ensuring an impulse largely constant despite variations
in
the state of the spring (if used).


I should have added that the later is the problem addressed by the
"remontoire" (and more crudely by a fusee). Neither address the issue of
the interference with the free oscillation of the pendulum or balance.

If your clock is weight driven, why have a "remontoire"?