ON THE STANDARD OF WEIGHT AND MEASUJRE. 



The firft gives the weight of 

 a cubic inch of diftilled 

 water under thefe circum- 

 stances = Affijftlli = 252,689 





The 2d 



And the 3d = fiVKfl l ft aa 252.829 



\ « | / 252.523 



t» 



I 



^55 



252.440 



252.663 



fr w 2* Refult. 

 s « 2 

 5 x o 

 |* .5 



« t> -o •* 

 *tt -a _ 

 c "H v5 



<o rt a s ~"' 



»- 5 2 m 



0££w 



39 



VI. It may perhaps however be proper to obferve here, By Mr. Gilpln*t 

 that the alteration in the fpecific gravity of water by change f tabIeSi 

 temperature, is eftimated in this table of Sir G. S. Evelyn's 

 (note on § 23), at nearly double that which is given by Mr. 

 Gilpin in his tables, in the Philofophical Tranfa&ions for 1794, 

 p. 382; his appreciation of it from 60° to 66° (taking it to be 

 equal to unity at 60 p ) being as follows; viz. 



61° 



62 



.99991 

 .99981 



63° 

 64 



.99971 

 .99961 



65° 

 66 



.99950 

 .99939 



I am, from my own experiments on this fubjecl, difpofed 

 to prefer thefe tables ; and taking them to be correft, we fhall 

 have a cubic inch by Sir G. S. Evelyn's fcale when at the tem- Ultimate refult. 

 perature of 60°, of diftilled water alfo at 60°, weighed in air A cubic inch of 



water at 6o*, in 

 air at 6o°, bar. 



252.568 



at 60 a , under a preflure of29f inches. 



By the cube = - 252.519*^ 



By the cylinder =s 

 By the fphere = 



And by a mean of all three = 



And if weighed in vacuo inftead 

 of in air = * 



252.806 



Grains of the 

 Parliamentary 

 Standard ac- 



appreciation of 

 it in § 41 ofhis rti# wm 

 Paper. 



or ~ 251.806 

 grs. in vacuo* 



Cecil Street, Dec. 20, 1802. 



J. FLETCHER. 



VII. On 



