"The object of much experimentation is to build or discover a suitable model. This is done by an iterative procedure in which a particular model is tentatively entertained, strained in various ways over the region of applicat.ion, and its defects found. The nature of the defects interacting with the experimenter’s technical knowledge can suggest changes and remedies leading to a new model which, in turn, is tentatively entertained, and submitted to a similar straining process."
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