MUSICAL INSTRUMENTS 125 



SUPPLEMENTARY QUESTIONS FOR CLASS DISCUSSION 



1. What is the most valuable use made of the phonograph? 



2. What circumstances might make the phonograph a more 

 desirable instrument to have in the home than a piano ? 



3. If phonographs had been in use for a long time, so that 

 records made 50 or 100 years ago could be obtained now, of 

 what use would they be to us ? 



4. How is the phonograph able to reproduce the human 

 voice ? 



5. How is the pitch of the tones determined and controlled 

 in each of the following instruments : piano, violin, guitar, and 

 the various wind instruments ? 



6. How do stringed instruments differ in the methods by 

 which the strings are set in motion ? 



7. How do wind instruments differ in the ways in which the 

 air is set into vibration ? 



REFERENCES 



Baker, Boy's Book of Inventions, Doubleday Page and Co., New 



York City. Chap. 7 (Phonograph). 

 Williams, How It Works, T. Nelson and Sons, New York City. 



Chaps. 14-16. 



