Straumann Double Hairspring
Using an escapement with Straumann Double Hairspring, which is installed in all of the Henry models, Moser has succeeded in preventing the gravitational error before it even occurs. The result is more stable accuracy in all positions.
In this escapement, two balance springs manufactured as a matched pair are arranged so that they oscillate against one another. This causes the centres of gravity of the two springs to move outwards and inwards on opposing symmetrical paths as they oscillate. The cumulative centre of gravity of the two springs thus remains at the centre of the arbor at all times, and as such has no negative influence on the accuracy of the watch.
Clearly, producing such a complicated escapement module requires mastery of the whole balance spring production process – from melting the material right through to completing the finished spring. Together with its associate company Precision Engineering AG, H. Moser & Cie developed the Straumann Hairspring® based on the formula used by the inventor of Nivarox, Prof. Dr. h.c. Reinhard Straumann. This ensures the necessary homogeneity of the material’s mechanical properties.
Furthermore, the springs are manufactured so consistently that they are even able to ensure uniform compensation for any elasticity in the presence of temperature fluctuations. This ensures that the centre of gravity does not wander from the centre of the arbor even when the temperature changes.