al, ed , Marks' Standard Handbook for Mechanical Engineers 11th Edition , Mc-Graw Hill, New York 2007 page 9-4• | Lord Kelvin: His Influence on Electrical Measurements and Units |
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The Science of measurement: A historical survey | Siemens supported his proposal by asserting that Watt was the first who "had a clear physical conception of power, and gave a rational method for measuring it |
Bureau International des Poids et Mesures BIPM | |
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