When a mechanical watch is placed flat on its back with the dial facing up, the balance wheel and balance spring remain in a virtually horizontal position with only some downward gravitational pull. When placed on its side, whether in the 12, 3, 6 or 9 o'clock position, I would assume that the vertical gravitational pull in the balance spring, will always be slightly larger than when its placed in a dial-up horizontal position. This because the balance spring as positioned in the balance wheel, is more wide than deep. In other words the distance from the center of the balance wheel (the staff) to the rim of the balance wheel, is greater than the up-to-down-distance of the balance staff. So when a watch is placed in any vertical position, this would always mean there is more friction from gravity and this would mean more resistance to the balance wheel when in swing. Thus my theory is that when placed in a vertical resting position, a mechanical watch will inevitably slow down. Always. In other words, which vertical resting position would not matter at all. Does this make sense or am I missing something?
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