CHAP. III.] 



ST2UNGED INSTRUMENTS. 



149 



constructed ; but it has been found by experiment that by applying 

 pressure, that is, imparting increased rigidity to that part of the belly 

 where the vibration appears to be greatest, the "wolf" will entirely 

 disappear. It has therefore been thought that if the belly could be 



FIG. 100. Instruments of the violin class : alto or tenor, violoncello or bass, and eontra-basso. 



strengthened or stiffened without adding materially to its bulk or 

 altering its proportions, the desired result might be obtained. 

 Accordingly the experiment has been tried of glueing small pieces of 



