While Stoddard originally intended the calliope to replace bells at churches, it found its way onto riverboats during the paddlewheel era. While only a small number of working steamboats still exist, each has a steam calliope. These boats include the "Delta Queen", the "Belle of Louisville", and "President". Their calliopes are played regularly on river excursions. Many surviving calliopes were built by Thomas J. Nichol, Cincinnati, Ohio, who built calliopes from 1890 until 1932. The Thomas J. Nichol calliopes featured rolled sheet copper (as used in roofing) for the resonant tube (the bell) of the whistle, lending a sweeter tone than cast bronze or brass, which were the usual materials for steam whistles of the day. David Morecraft pioneered a resurgence in the building of authentic steam calliopes of the Thomas J. Nichol style beginning in 1985 in Peru, Indiana. These calliopes are featured in Peru's annual Circus City Parade. Morecraft died on December 5, 2016.