INDOOR RECREATION 



notes of higher pitch are caused by the more rapid vibra- 

 tion of shorter strings. In stringed instruments, such as the 

 banjo, guitar, mandolin, violin, and cello, the musical 

 scale is made by cutting down the length of the string by 

 means of shortening it with the ringers. In the case of 

 the piano and harp, the strings are all made of varying 

 lengths, each producing its own tone. Just as we found 

 in changing the shape of our mouth and tongue we could 

 produce different qualities of tone, so the instrument 



maker produces different quality by making his instru- 

 ments in different shapes. 



The phonograph. The phonograph has become a very 

 important part of our home life, for though relatively 

 few of us can make music, most of us- enjoy it. The 

 phonograph is a musical device for reproducing sounds. 

 The original sounds are recorded as a fine wavy line on a 

 wax cylinder or plate. The records we buy are duplicates 

 of this original, or master record. The reproducing mech- 

 anism has a diaphragm capable of very delicate vibra- 

 tions. This is connected with a needle which rests on the 



