In turn, this was used to predict the locations of hot spots in castings and thus to check, using the analog computer
, a proposed gating and risering system, rather than following the classical trial-and-error technique.
For the sake of accuracy, we should not forget to mention analog computers
although they are very rare today.
Pennie, a Toronto native, was originally a partner in Image West, a California-based company that used analog computers
to distort video images.
Whereas analog computers
maintain some direct connection to data sources, digital computers require that all inputs and outputs be mediated through a symbolic code or language.
are capable of simulating mathematical models and contain at least analog, control, and programming elements.