Thermal luminescence dating
The layer needs to be thick enough for the light reflected from the different surfaces to cancel each other out through destructive interference.
Destructive interference, in simple terms, is when two opposing waves are offset so that the peak of one wave always coincides with a trough of the other, thereby canceling each other out.
The splitting of the light mentioned above then takes place both on the surface of the glass and also on the surface of the thin anti-reflective layer.
The light reflected from this layer overlaps with that from the glass itself.
The average amplitude values of most watch movements made today are between 250° and 300°. DIAPAL Technology deals with this problem at the root, by dispensing with the need for oil altogether.The to-and-fro motion of the balance is translated by means of a small ruby pin (ellipse) into to-and-fro rocking of the anchor.Within this rhythm the anchor, in turn, inhibits the anchor wheel and therefore the entire gear train of the watch (escapement).Devices or equipment, the functions of which are protected from magnetic interference by the use of suitable materials and/or screening up to a specified level, are antimagnetic.
When light hits a glass surface it splits in two: one part of the light is bounced back as a reflection, the other goes into the glass.To compensate for the softening and lengthening of the balance spring as the temperature rose, the inertia of the balance was made obversely dependent upon the temperature.