|Former Member||22/11/2019 21:53:57|
|3578 forum posts|
[This posting has been removed]
|Simon Feather||25/11/2019 09:29:29|
238 forum posts
I found a couple of references - there seem to be two possible reasons for having the two main springs.
- to maintain the drive so the clock never runs down - the idea being that you wind alternate sides on alternate days;
- or to provide extra power to drive ancillary gear e.g. a clocking-in stamp
Lots of theories!
|3523 forum posts|
Clocks don't usually run down becaue they have either a 30 hour (wind daily at the same time) or 8 day (wind weekly on the same day) movements. I used to wind the market place clock each Saturday night (around midnight) and it took 16 turns of the key IIRC. The clocking-in stamp is interesting though when I've worked places where clocking in was required it was a separate clock (clock number 734 ).
It's ticking away as I type.
|Gary Manuel||25/11/2019 13:11:37|
2190 forum posts
No clock expert by any stretch, but here's my suggestion.
When you wind a clock up, you turn it against the spring tension and thus remove the spring pressure that is driving the clock mechanism. Having two main springs means that one spring is always driving the mechanism - even when the other is being wound. Two springs is to prevent the clock losing time during winding.
|Don Fry||25/11/2019 14:23:16|
4557 forum posts
Geoff, how long does it run for?
|3523 forum posts|
That's true, Gary. However, I used to put the market place clock right each time I wound it. It wasn't far out. I'm ashamed to say that I haven't bothered to wind the same movement now it's in a new case hanging on the wall at home for a year or two - it's not in a room we use very often.
Ron, it's an 8 day movement. It also takes an awful lot of effort to wind - both springs are very strong.
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