An experiment in search of a directive action of one quartz crystal on another

A quartz sphere, 0·9 cm. diameter, weight 1·004 grams, was suspended by a long quartz fibre so that its time of vibration was about 120 seconds. A second quartz sphere, 6·6 cm. diameter, weighing 399·9 grams, with its centre on a level with that of the first and 5·9 cm. from it, was rotated continuously in a period of 115 seconds in one series, and in a period of 230 seconds in another series of observations.