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Used with caution, such formulae really are very useful indeed, and indeed they form the professional stock-in-trade of most engineering designers and draughtsmen. There is not the slightest need to be ashamed of using them; in fact we all do. But they must be used with caution.

— J. E. Gordon Structures (or, Why Things Don't Fall Down) (1978)

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Notes from Wikiquote

Make sure that you really understand what the formula is about. | Make sure that it really does apply to your particular situation. | Remember, remember, remember, that these formulae take no account of stress concentrations or other special local conditions.

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Quote text and notes from Wikiquote: J. E. Gordon (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.