Pratten model flute by Boosey at top and the same model flute by an anonymous maker below.
From about 1856 Boosey & Co.produced flutes to Pratten’s design. At first he modified the eight-key system keeping new keywork to a minimum.
Pratten cylindrical bore flute, Boosey & Co.1906
made improvements to his flutes bringing out his Perfected Flute in about 1857
which had large tone holes, a cylindrical bore and up to seventeen keys. It
found favour with a number of players and Boosey