Observation against the Weight Reduction of Spinning Gyroscopes

Recently, Hayasaka and Takeuchi (H-T) reported the anomalous weight reduction of spinning gyroscopes for right rotations around the vertical axis but no weight changes for left rotations. Although we examined the asymmetric weight changes using a gyroscope similar in mass and in equivalent radius to the lightest one of H-T, the observed weight changes, (-0.20± 0.35) mg for left and (-0.02± 0.33) mg for right rotations, are consistent with zero, and the data for right rotations are not compatible with those presented by H-T.