About 20 to 30 years ago, when computers were not widely available for use by analysts or engineers, all the produced experimental data were available in the form of charts and nomographs. In the old days, knowledge production was not so competitive; for this reason, it was available almost for free.
An engineer searching old papers and books to solve engineering design problems can often find excellent nomograms or diagrams that resulted from empirical data. However, because of their complexity, they are difficult to be expressed as a series of equations. This weakness limits considerably the use of such nomograms and diagrams in general engineering design problems. Consequently, the nece
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