Abstract
It has been reported that the pointer shaft having sliding bearings rotates under mechanical vibration. In this paper, better bearings for the shaft are given and furthermore, why they are better are explained theoretically and experimentally. Although jewel-pivot bearings are better than sliding ones, the former causes remarkable instrumental error, 10 to 15 degrees for example. When ball bearings are used with pointer shaft, no unnegligible error is observed. Ball bearings are the best for the instruments under vibration. A spannbanded pointer shows no instrumental error, too, but it often resonates with low frequency vibration across the band.
