SAFETY PLATES 2.1.4 VIBRATIONS TO WHICH THE OPERATOR IS SUBJECTED According to the results of the tests carried out to determine the vibrations transmitted to the operator by the ma- chine, the upper limbs are subjected to vibrations lower than 2.5 m/sq.sec. (1.7 ft/sq.sec.), while the seated part of the body is subjected to vibrations lower than 0.5 m/sq.sec. (8.2 ft/sq.sec.) 37