Difference Engine did contribute to one highly successful
venture. It inspired a Swedish printer, George Scheutz
to build his own engine to calculate differences and print
tables. He and his son Edward accomplished this in 1843.
They built two machines. One went to the Dudley Observatory
at Albany, New York. The other to the Register General
at Somerset House in England. These two machines are at
the Smithsonian and the Science Museums. IBM has a replica
in its collection.
to the branch in the road that led to commercial calculators:
One of the beginnings of commercial calculators coincides
with the typewriter and derives its concept from keyboard
musical instruments. Considerable ingenuity was required
to make this principle, the the keydriven machine, work