Most visitors online was 4107 , on 14 Jan 2023
Unless of course, someone actually knows what it is!Is it actually connected to anything?
GrahamThe index pins should also be parallel, which these aren't at the moment, giving rise to possible unwanted variations of rate in positions.
I assume you mean for non-parallel pins acting a non planar spring - as is likely to be the case where there is an overcoil.
If my understanding is correct, is it the case that 'unwanted variations' will also be present if the spring coil is not in the same relative position between the pins throughout their arc of rotation (checked when the balance is stationary)? Again, if my understanding is correct, I think this would lead to greater variation and it would also apply to a planar spring.