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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![[ 4! ] the quicklime is proved to contain as much heat as the chalk previous to its calcination) it follows, that the difference -between 25 and 16 (or 9) exprelfes the quantity of heat in fixed air, and, therefore, taking equal quan- tities of chalk and fixed air, the heat of the fixed air will be to that of chalk as (9x3 or) 27 to 25. But by the firft Experiment if appears that the heat of chalk is to that of water as 1 to 3.9. The heat of fixed air there- fore is tq that of water as 27 to 25x3.9 or nearly as 1 to 3.6. With regard to the firft Experiment in this very complicated inveftigation, it may be ob- ferved that it is defe&ive in feveral refpeels. The heat of the air in the room is emitted* the different temperatures at the furface ar.d bottom are not fpecified, the heat of the mixture is only given for two minutes, during, which time the chalk cannot pofiibiy have ac- quired its greatefc heat, for Dr. C. reprefents this procefs to be a very flow one *; in lhorc the whole Experiment bears fo much the ap- pearance of inaccuracy, that nothing can be concluded from it with any tolerable precifion. #^Pagc 45.](https://iiif.wellcomecollection.org/image/b21513958_0047.jp2/full/800%2C/0/default.jpg)
