The Dopyeras turned the resonator upside-down and modified its V shape into a W, connected to the bridge by a long screw through the center. John and his brothers decided to split from National. Beauchamp and Dopyera had been rubbing each other the wrong way for some time, and this came as the last straw. National’s president, George Beauchamp, overruled Dopyera and rushed the Triolian into production in late 1928. John Dopyera developed the biscuit-bridge system for use in a ukulele, but felt the design did not sustain well enough when enlarged for a guitar. The Triolian’s bridge sat in a round wooden “biscuit” mounted in the center of a metal amplifying cone. They called their new instrument the Dobro. For months, the inventor of the resonator guitar spent his evenings and weekends working with his brother, Rudy, on a secret project – a single-cone guitar they believed superior to the National Triolian. When John Dopyera stormed out of the National shop in January 1929, his resignation stemmed from more than a spur-of-the-moment tantrum.
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