William Thomson Quotes on Measurement
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I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science, whatever the matter may be.
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There is nothing new to be discovered in physics now. All that remains is more and more precise measurement.
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Measuring the Absolute: William Thomson and Temperature (2002) by Hasok Chang and Sang Wook Yi (PDF file)