SM0486
suitable industrial solvent. The unit should then be promptly dried with a light
blast of clean, dry air. Keep in mind that when you use volatile cleaning fluids
you should take proper precautions for adequate ventilation.
c. Should the contamination and dirt be very stubborn, it may be
necessary to completely disassemble the movement parts to gain access to all
bearing holes.
Great care should be exercised not to damage or distort the
hairspring. If excessively worn parts are evident they should be replaced.
(2) Hysteresis.
a. Hysteresis is the variation in pointer position, at any given
point, between upscale and downscale indication after light tapping to minimize
friction in the mechanism. Figure 8 illustrates an example of hysteresis.
Figure 8.
Hysteresis-dial example
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