txtCommentary={\f1 Button.} The button is the screw mechanism at the very end of the bow stick that regulates the bow-hair tension. Turning the screw in either direction slides the frog up or down a track within the bow stick, increasing or decreasing the tension on the bow hair. Early {\uldb bows}{\v 21373} had no buttons and the tension was regulated much more crudely. The modern button allows the performer a
txtHeading=The Bow
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imgInstrument=t085538a.dib
txtCommentary1= precise regulation. In order to preserve the resiliency of the wooden stick, players loosen the bow hair whenever they are not playing. {\fs24\uldb\'80}{\v next}