MISCELLANEOUS INFORMATION". <g21 



country; feveral pieces of them having been found in the 

 ruins of very old buildings. 



In Dumfriesthire there is a fmall pair of mill (tones on a Mill of Dum- 

 frame, driven by a crank, a vertical cog wheel, and a hori- 

 zontal pinion, which grind very well, and are extremely ufe- 

 ful. The ftones have a drum and hopper like a tingle mill. 

 An eafy expeditious method of reducing grain to flour, is of 

 the utmoft confequence to the inhabitants of every civilized 

 country, and ingenious men deferve our befl thanks for their 

 reiterated attempts to obtain fo defireable an end. 



II. Obfervations on thefuppofed Determination of the real Zero. On the zero of 



heat. 

 Many eminent chemifts have endeavoured to difcover the 



real zero, or the divifion on the thermometric fcale corre- 



fponding to the total privation of caloric, but their labours 



have hitherto been unfuccefsful. Dr. Irvine of Glafgow con- Dr. Irvine. 



trived a theorem Tor this purpofe, which he founded on fup- 



pofitions and experiments ; and Mr. Dalton has lately propofed Mr. Dalton. 



an hypothefis for the folution of the fame problem. Thefe 



may be confidered in their order. 



Without giving Dr. Irvine's theorem, which is fo well 

 known, I (hall infert the principal refults of the experiments 

 and calculations founded on it. 



In the following tabular view, the numbers in the firft co- Determinations 

 lumn denote degrees of Reaumur's fcale above or below the ° f f er ,° *™ m 

 freezing point, and thofe in the fecond column indicate de- re m. 

 grees of Fahrenheit's fcale above or below the fame point, ac- 

 cordingly as the fign plus or minus is prefixed refpe&ively. 



Reaumur. Fahrenheit. 



M M. Lavoifier and Laplace, from 

 experiments on a mixture of nine parts 

 of water and 16 parts of quicklime, 

 place the real zero at - - — 1537°= — 3458£° 



Their experiments on a mixture of 

 fulphuric acid and water, in the pro- 

 portion of 4 to 3 refpe&ively, fix it at — 3241 = — 7292J 



Their experiments on a mixture of 

 the fame fluids in the proportion of 4 

 t© 5 place it at - —1 169=— 2630| 



And 



