‘The Hansen Writing Ball was invented in 1865 by the Rasmus Malling-Hansen. The writing ball was first patented and entered production in 1870, and was the first commercially produced typewriter.’
Nietzsche owned a writing ball and wrote a poem about it:
‘The Writing Ball is a thing like me: of iron
Yet twisted easily – especially on journeys.
Patience and tact must be had in abundance
As well as fine [little] fingers to use us.’