I have been turning some of my idle thoughts lately upon
an arithmetical machine . . . (it was to multiply and divide figures of any magnitude) . .
. I intend to make an attempt to make it; I say an attempt, for though the machine is
exceedingly simple, yet I have learnt by experience that in mechanics many things fall out
between the cup and the mouth.
James Watt, writing to a friend. The device was never created.