The Physical Papers of Henry Augustus Rowland Microform
The Physical Papers of Henry Augustus Rowland Microform
Rowland, Henry Augustus, 1848-1901
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14 Yerre de- Suede +. 56 and these are probably somewhat nearly correct, except the negative value for Choisy-le-Eoi. With the exception of Eegnault, very few observers have taken up this subject. Among these, however, we may mention Eecknagel, who 4 Comptes Rendus, Ixix. Osr THE MECHANICAL EQUIVALENT or HEAT 357 has made the determination for common glass between and 100. I have found approximately the constants for my formula in this case, and have calculated the values in the fourth column o...f the following table. TABLE IV. RECKNAGEL'S RESULTS COMPARED WITH THE FORMULA. Mercurial Thermometer. Air Thermometer. Difference. Observed. Calculated. 10 10-08 10-08 20 20-14 20-14 30 30-18 30-18 40 40-20 40-20 50 50-20 50-20 60 60-18 60-18 70 70-14 70-15 + 01 80 80-10 80-11 + 01 90 90-05 90-06 + 01 100 100-00 J=290, a = . 000 000 33, It will be seen that the values of the constants are not very different from those which satisfy Eegnault's experiments. There seems to be no doubt, from all the experiments we have now discussed, that the point of maximum difference is not at 50, but at some less temperature, as 40 to 45, and this agrees with my own experiments, and a recent statement by Ellis in the Philosophical Magazine.
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