While the first lot of recording-adders manufactured by Felt were
wholly practical, as was well proved by the statements of those who
purchased them, it is easy to pick out features in their make-up that
today, when compared with the new highly-developed Art, would seem to
make them impractical.
The necessity of operating from right to left and the necessity of
printing the totals by key depression were features that, in view of
there being nothing better in those days, did not seem objectionable to
those who used them. They were features, however, that Felt overcame
and eliminated in the next lot of machines manufactured and placed on
the market in 1890.
[Illustration: FELT'S COMPTOGRAPH