A NEW TOXOSCOPE 207 



pressions as their first impressions regarding matters of pitch. 

 For a child to be at all musical he must learn the musical scale. 

 The scale is fundamental although simple and usually quickly 

 learned by the child, and a little time spent with him with the 

 tonoscope as an aid will give him these correct impressions. 



The stroboscopie drum with its phonograph motor drive used 

 in the demonstration of the new tonoscope at Des Moines is 

 shown in figure 22. The lighting scheme for the stroboscopie 

 method is indicated in figure 23. 



Physics Laboratory, 

 State University. 



