Waves 15 
was this property which was allegedly used by Caruso to 
break wine glasses with his voice alone. He simply sang the 
note which the wine glass preferred. The glass trembled and 
vibrated so violently that it is supposed to have shattered. 
Bodies of water (lakes and bays) exhibit the same phenom- 
enon. Their water tends to vibrate in certain definite periods, 
WEST BERKELEY 
SAN 
FRANCISCO 
GOLDEN 
GATE 
SAUSALITO iN 
Oscillation with three nodes in San Francisco Bay, according to experi- 
ments by Honda, Terada, Yoshida, and Isitani. 
the waves being called seiches (pronounced “say-shes” ). The 
periods of these waves depend upon the size of the lake or 
bay just as the tone of a bell depends upon its size. A large 
bay tends to exhibit long period seiches; a small bay, shorter 
period vibrations. A good example of this kind of wave mo- 
tion is to be found in San Francisco Bay, California, where 
