The bull-fiddle is also known as the double this
[DOC] [TLE] double bass | musical instrument | Britannica.com [PAR] Double bass, also called contrabass, string bass, bass, bass viol, bass fiddle, or 
bull fiddle French contrebasse, German Kontrabass, stringed musical instrument
... [DOC] [TLE] Bull fiddle | Define Bull fiddle at Dictionary.com [PAR] Bull fiddle definition, double bass.