Abstract
In this paper the history of automation of real-time industrial process control is studied via a case study of the Dutch Hoogovens Steel Company. Before the Second World War, in this company, process control was based on intuition. After the War, as a consequence of changes in the steel market and the increasing complexity of steelmaking technology, demand for computing equipment grew. Prior to the introduction of digital computers, the company applied special slide rules and built several analogue computers for process control. In this paper the reasons for the choice between alternative computing technologies are addressed as the evolution of process control automation is studied.
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