En realidad está directamente relacionado
La amplitud de giro del volante viene condicionada precisamente por la carga que tenga el reloj. A más carga más tensión en el muelle real y, por tanto, mayor amplitud de giro del volante (el reloj atrasa). Y al contrario, a menor reserva de marcha menos tensión en el muelle y menor amplitud de giro (el reloj adelanta).
En un artículo para el Wyler con "Trust Index" se comenta lo siguiente:
"
The trust index opposite at 3 o’clock indicates the amplitude of the balance wheel. When the watch is fully wound, the amplitude of the balance wheel is generally a little higher than the optimum level, before it stabilises and then drops drastically as the power reserve reaches zero. By keeping the trust index hand in the middle of the scale when winding the watch, the wearer can therefore ensure optimum accuracy without over-winding the watch." (
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Y en un artículo sobre el Concord:
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Just opposite the power-reserve indication, the trust index display provides information on the amplitude of the balance. It serves to preserve an extremely high level of precision by avoiding excessive tension in the mainspring due to maximum winding. By ensuring that the trust index hand remains at the centre of the graduated scale (and does not reach the + zone) when winding the watch, the user can maintain perfect accuracy. Clad in the Concord shade of blue and thus providing the only colorful accents on the dial, the power-reserve and trust index hands cleverly point to these two horological complications." (
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Un saludo.
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