EXPERIMENTS WITH THE DISPLACEMENT INTERFEROMETER. 67 



36. Plates electrically charged. The endeavor is next to be made to over- 

 come the repulsion of plates by aid of opposite electrical charges placed upon 

 them. The experiments at present will necessarily be somewhat crude, since 



TABLE 7. Effect of electrical potential. Constants as in table i. 12.5 volts applied. 



* Swinging. 



ft) 



B 



FIG. 41. 



the pier is liable to warp during the time in which the observations are made. 

 Nevertheless the corroboration obtained is of great value. 



