An examination of Dr. Crawford's theory of heat and combustion / by William Morgan.
- William Morgan
- Date:
- 1781
Licence: Public Domain Mark
Credit: An examination of Dr. Crawford's theory of heat and combustion / by William Morgan. Source: Wellcome Collection.
Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.
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![[ *7 ] . perimenfc was raifed from 71 to 100.5*, the difference for 29.5) being divided by 8 gives 3.7 tor the heat which was feparated from the water by the veffcl—Subtratting 101 (the tree temperature of the mixture) from 116, and 3.7 again from the remainder, we have 10.4 for the number of degrees which the water was cooled by the oats alone f. And fince the oats were raifed from 71 to 101.9 or 30.9 de- grees, it follows, that the fame quantity of heat which will change the temperature of the water 10.4 will change that of oats 30.9, and therefore the abfolute heat of water is to that of oats as 30 9 to 10.4, or nearly as 2.9 to 1. * I have exactly followed Dr. C.’s method in making this Experiment, but I can fee no good reafon for deducing the heat of the veffcl from the temperature of the mixture at the end of the firft minute, rather than from the fourth pro- portional, which js fuppofei to give the true temperature of the mixture at the beginning of the frjl minute. f It does not appear that the oats in this Experiment were really heated to the degree fuppofed by Dr. C.— The Thermometer might only (hew for fevcral minutes the joint effeds of the hot particles of water and the colder particles of oats in contad with it. For this reafon Sir jfaac Newton’s rule feems to be improperly applied ; I r the heat carried off after the firft minute may not be carried off by the air only, but by the air and the cold fubllance jointly.](https://iiif.wellcomecollection.org/image/b21513958_0023.jp2/full/800%2C/0/default.jpg)
