First of all, the antique watch with particular attention to anti-magnetic, as well as the assembly of antique movement of the table, their material is not made in accordance with modern technology, anti-magnetic performance is weak.
Second, the ultra-thin form is susceptible to magnetization. Because of the small footprint of the ultra-thin movement , conventional anti-magnetic measures (such as blocking the magnetic field through a thick case) are difficult to implement.
In addition, mechanical watches in modern life more and more exposure to the magnetic field, the intensity is also growing. Not to mention the impact of the accuracy of travel time, for a long time to watch in a strong magnetic environment on the movement is not small damage. In the high-end watches to mechanical movement to occupy the absolute dominance, if not even the accuracy of the operation can not be guaranteed, then any other function is only superfluous.
Mechanical watch anti-magnetic basics:
1) Mechanical watch anti-magnetic specifications
Japanese mechanical watches: usually do not mark anti-magnetic, marked with ordinary anti-magnetic and marked with enhanced anti-magnetic 3.
Non-standard anti-magnetic: can resist 1600A / m magnetic field (equivalent to 20 Gauss).
Ordinary anti-magnetic (the figure is a horizontal cross below 'U' in the reverse direction): Can withstand a magnetic field of 4800A / m (equivalent to 60 Gauss).
Reinforced anti-magnetic (the figure is reversed 'U' plus two horizontal): Can withstand a magnetic field of 16000A / m (equivalent to 200 Gauss).
Talking about anti-magnetic your brother, I have to mention Rolex MILGAUSS watch , this watch with its own special rare earth Parachrom nickel-cobalt-blue steel hairspring, with almost no openings of the fully sealed antimagnetic soft iron cover, will improve the anti-magnetic function to the extent of 100000A / m, called anti-magnetic watch Fan.
2) the attenuation of the magnetic field with distance
The strength of the magnetic field is inversely proportional to the square of the distance, and as the distance increases, the intensity of the magnetic field sharply decays.
Ordinary antimagnetic mechanical watch, as long as more than 5cm away from the above magnetic enough security. Even if it is not marked with antimagnetic mechanical watch, but also to leave a little further (10cm above) on the line. In daily life, as long as a little attention, you can avoid the hazards of the magnetic field on the mechanical watch, no need to talk about magnetic discoloration.
3) Examples of ordinary magnets
Mobile phones, telephone handsets, computers, razors, radios, handbags magnetic buckle, refrigerator door, induction cooker, magnetic bracelets, magnetic pillows and so on.
Mechanical watches by the magnetic hazards
Mechanical watch travel time by the gossamer and balance wheel control. After the watch by the magnetic, the magnetic makes the swing frequency of the balance changes, so the operating speed of the gear system also changes, mechanical watch go crazy. By magnetic, mechanical watch may stop, slow, or fast. Light symptoms, the error of tens of seconds. Severe, the daily error of several points. After the mechanical watch by magnetic, its magnetic will not retreat, need to make degaussing repair to return to normal.
Method of diagnosing mechanical watch by magnetic
Always suspiciously suspect his mechanical watch is not subject to magnetic, will seriously affect the human spirit of tranquility, here to introduce a diagnostic mechanical watch by magnetic easy way: to stall to buy a compass, the mechanical watch near the compass, if the compass deflection Very powerful, that mechanical watch is by magnetic. Even if the mechanical watch is not subject to magnetic, because the mechanical watch itself is made of steel, when the mechanical watch near the compass, the compass will also be fretting, but the degree of deflection is small.
This method can also be used to detect the presence of a magnetic field where the mechanical watch is stored. Take the compass to the place where the mechanical watch is kept. If the compass is deflected, there is a suspicious magnet nearby. Iron and steel tools at home, such as pliers, are often magnetically close to magnetic objects when they are unaware. Mechanical watches should also be kept away from such magnetic tools have been.
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