33 ON THE STANDARD OF WEIGHT AND MEASURE. 



it would have been found to poffefs in air in this latter ftate. 

 Thefe corrections for the denfity and temperature of the air 

 we (hall find, from the data before given in this article, to be 

 as follows : 



Of the weight of the water difplaced by 



the cube - 



Of the weight of th* water difplaced by 



the cylinder - - - 



Of the weight of the water difplaced by 



the fphere - 



Correction of fp. The weights of thefe bulks of water, therefore, if weighed 



gr. of water j n a j r at g ° under a preflure of 29f, would be found to be 

 when reduced to _. ,.,-,.. . z 



€o*. 



Firftly, by Sir 

 G. S. Evelyn's 



table. 



That difplaced by the cube 31381.79- .642 — .201 = 

 31380.95 grains; 



That difplaced by the cylinder 19006.83 - .389 - .122 ss 

 19006.32 grains; 



And that difplaced by the fphere 28673.51 -{- .282 — .644 

 = 28673.15 grains. 



V. We have now, however, to correcl thefe weights for 

 the change which would take place in the fpecific gravity of 

 the water itfelf, by reducing it to 60° of temperature ; that 

 in which the cube was weighed having been at 60.2° (§ 22) ; 

 that in which the cylinder was weighed at 60.5° (§ 23) ; and 

 that in which the fphere was weighed at 66* (§ 30). 



We will firftly do this by the help of Sir G. S. Evelyn's 

 Tab. I. in his note on § 23, according to which, a quantity of 

 water of equal bulk with the cube would, at 60° of Fahren- 

 heit's thermometer, weigh 31 380.95 x 1.000033=31381.986 

 grains; one of equal bulk with the cylinder, 19006.32 x 

 1.000083 = 19007.897 grains ; and one of equal bulk with 

 the fphere, 28673.15 x 1.00099 = 28701.536 grains; if 

 weighed in air at the fame temperature, when the barometer 

 ftands at 29 inches and a half. 



The 



