Standard for antimagnetic watches
When the watch is accidentally exposed to a magnetic field with a strength of 4800A/m, the residual effect of the quartz watch does not exceed 1.5 seconds, the residual effect of the mechanical male watch (the movement area is greater than 314 square millimeters) does not exceed 30 seconds, and the residual effect of the mechanical female watch does not exceed 45 seconds. seconds, such a watch can be called an antimagnetic watch.
In the 19th century, the governors of watches were, basically, made of steel, so they were extremely susceptible to magnetic fields. The first preventive measure is to place the pocket watch in an empty wax-plated tin box. Although this box can play a very effective protective role, it has a big disadvantage, that is, it needs to be opened every time to tell the time.
The first 25 years of the twentieth century saw significant changes in this field. In 1920, the Nobel Prize winner, Charles-Edouard Guillaume from Fleurier, Switzerland, invented an iron-nickel alloy, which replaced the early steel alloy balance spring and greatly improved the balance spring from the following three aspects.
The reliability of the watch:
1. Not easily affected by magnetic force.
2. Moisture is not easy to rust.
3. Not easily affected by temperature changes (this is the main research direction of Guillaume).
The use of this alloy and stainless steel in the case makes the watch less susceptible to magnetic fields at home or in ordinary industrial settings.
What about gold?
Cases made of gold do not protect the watch well from magnetism. Therefore, the most sensible solution is to equip the movement of these timepieces with a paramagnetic case cover made of iron and permalloy or permalloy. This precaution is usually not taken for aesthetic reasons. A gold watch with a protective cover that doesn't look very fancy makes it even harder to sell. Perhaps, one day, watchmakers will pay more attention to this issue. At the same time, wearers should also be more careful not to expose their timepieces to magnetic fields.
Antimagnetic performance
At present, the most used is the built-in soft iron inner shell to achieve a high anti-magnetic effect. The famous pilot series of IWC and the Mileguass of Rolex are well-known. The highest-level anti-magnetic watch is the 15,000-gauss anti-magnetic watch launched by Omega in 2013. The movement components are made of anti-magnetic material and can withstand a magnetic field strength of more than 15,000 gauss.
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