In England, Stephenson invents his "Rocket", Peel his police force, child labour and slavery were abolished, and the Great Exhibition celebrates the greatness of Victorian Britain.
For our purposes, we can assume that interest in the eight key flute as a "fine music" instrument started to wane from around 1850; certainly there is evidence that few eight key instruments were made after 1870.
While occasional instruments were made up to and beyond the turn of the century, the period 1820 to 1860 probably encompass the eight key's early golden years.
It's interesting to look at what else was happening in the world during that period.
He left the army in or around 1820 and took up teaching the flute in London.
At first, Rudall supplied his students with instruments bearing his name, but these were actually made for him by the flutemaker Willis who resided in Clement's Inn.
In 1821 Rudall formed a partnership with Edinburgh flute maker John Mitchell Rose and in 1850 Richard Carte joined the firm.The various combinations worked from a series of addresses, which are useful in dating instruments.These are: The information above is largely taken from Langwill's Index of Musical Wind Instrument Makers.Rudall, Carte & Co was bought out by Boosey & Hawkes Ltd in 1955.The company did not limit themselves to flutes but were involved particularly in the later years with a wide range of wind and brass instruments.Nor were their flutes limited to eight key models, indeed, Rudall & Rose were appointed by Theobold Boehm to manufacture his newly designed instrument in England.