Experiments with Rdntgeris Rays. 



457 



or its lower oxide fouls the mercury when impure pentoxide 

 is heated. 



Experiments made to test ivlietlier Rontgens Radiation is 

 associated ivith cether currents in any way. 



With regard to hypothesis (2) Michelson has put into our 

 hands a comparatively simple method of obtaining the inter- 

 ference of two beams of light which may be used for detecting 

 the presence of aether currents by their influence on the 

 velocity of light travelling through the moving aether. 



The arrangement employed in fig. 2 was made use of for 



% 2. 



% 



% 



the purpose of determining whether Rontgen's radiation is 

 associated with aether movements. 



In this arrangement the light from L is divided into two 

 beams at A which travel round from mirror to mirror in 

 opposite directions, eventually reaching the telescope T. 

 When the adjustment is correct, interference-bands are seen 

 on looking into the telescope. 



In this experiment it was estimated that a shift of the 

 bands equal to one tenth of the width of a single band, or a 

 widening of the bands by one fifth of the same amount, 



