An experimental comparison of formulae for total radiation between 15 degrees and 110 degrees C
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Abstract
THE earliest attempt to express the rate of cooling of a heated body was that made by Newton and embodied in a simple formula, which states that this rate is directly proportional to the difference of temperature between the radiating body and the medium surrounding it.It has long been known that this law is only approximately true when these temperature-differences are small, and that it is wholly inapplicable when they are large.During the early part of the present century an elaborate research on the measurement of temperature and the communication of heat was made by Dulong and Petit.*Such instruments as the thermopile, the bolometer, and the galvanometer had not yet been in vented.Their method was to employ as radiating body a large thermometer whose bulb contained more than a kilogram of mercury.This was placed within an envelope which was kept at constant temperature and made nearly vacuous as quickly as possible after the introdulltion of the heated bulb.The rate of cooling was found to be a function of the temperature of the envelope, the latter being kept constant during any given experiment, but varied for different experiments.For a given difference of temperature between the bulb and its enclosure it was found that the rate of radia• tion increases very nearly in geometrical progression while that of the enclosure increases in arithmetical progression.
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| Authors | W. L. Stevens |
| Journal | american journal of science |
| Year | 1892 |
| DOI |
10.2475/ajs.s3-44.264.431
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| URL | |
| Keywords | Keywords not found |
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