Frequency deviation of cantilever vibrator by the effect of gravity is calculated. the perturbation method is used. The result is as follows. (i) Eigenfrequency is not changed by the component of gravity which acts perpendicular to the cantilever. (ii) Eigenfrequency is changed by the component of gravity which acts lengthwise to the cantilever. The frequency deviation is shown by the equation (41), and the const-ant C in the equation is shown in table 1 and figure 5.
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