PART VII. RECREATION IN THE 

 HOME 



CHAPTER XXIV 

 INDOOR RECREATION 



Problems. i. To learn the nature of sound and the re- 

 lation of our voice and ears to sound. 



2. To learn simple principles underlying music and 

 musical instruments. 



3. To cultivate the habit of reading good books. 



4. To see how to get the most home enjoyment in stories 

 and games. 



5. To learn some ways to have fun with mechanical and 

 electrical toys. 



Experiments and demonstrations. i. To show that sound is due 

 to vibration. 



2. To demonstrate static electricity. 



Project I. To UNDERSTAND THE MECHANISM OF THE PIANO 



AND THE PIANO PLAYER. 



1. The wires, relation of sizes, lengths, tension. How tuned? 



2. Key action? Diagram to show it. Keyboard? Octaves? 



3. Pedals. Action and control? 



4. Player pump air pressure or exhaust. How does air con- 

 trol key action? Use of the music roll? 



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