The Thermal Measurement of Energy. Lectures Delivered At the Philosophical Hall, Leeds
The Thermal Measurement of Energy. Lectures Delivered At the Philosophical Hall, Leeds
E H Ernest Howard Griffiths
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This value differs by 1 part in 400 from determi- nations made by Rowland and others. In fact the thirty- five observations from which Joule calculated his final value give results which differ by more than 1 per cent, from each other, and his thermometer did not permit the most accurate reading of temperature. The cause of these discrepancies is to be found in three conditions of the experiment : irregularity of the stirring, which was done by hand, incomplete correction for loss of heat by ra...diation, and insufficient knowledge of the variations in the readings of mercury-in-glass thermometers caused by variations in the conditions under which they are used and standardised. Let us now on account of its intrinsic interest consider briefly the work of HiRNl I may say at once that it is impossible to attach any importance to his numerical results. His thermometry was far too vague and his energy-measurements were also not of the highest ac- curacy. Nevertheless, his work is important; because, not only was his method of degrading energy entirely different from that of Joule but he also endeavoured to obtain the value of the equivalent by the reverse process, that is by measuring the disappearance of heat from a 1 Theorie MScanique de la Chaleur.
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