Masterpieces of Science 



at a distance of several feet. In all these cases a 

 slight shock is experienced so long as the contact 

 is preserved. The introduction of a piece of 

 paper between the parts in contact does not ma- 

 terially interfere with the production of the 

 sounds, but the unpleasant effects of the shock 

 are avoided. 



When an intermittent current from a Ruhm- 

 korff's coil is passed throtigh the arms a musical 



Fig. 12 



note can be perceived wnen the ear is closely 

 applied to the arm of the person experimented 

 upon. The sound seems to proceed from the 

 muscles of the fore-arm and from the biceps 

 muscle. Mr. Elisha Gray has also produced 

 audible effects by the passage of electricity 

 through the human body. 



An extremely loud musical note is occasioned 

 by the spark of a Ruhmkorff's coil when the 

 primary circuit is made and broken with suffi- 

 cient rapidity. When two breakers of differ- 

 80 



