new standards of weights and measures. ' 23 



The avoirdupois pounds were distinguished from each 

 other by the following marks. 



That which I shall call C 1 P" Av'' 

 No. 1. 1 1824 



No. 2. -J 



' 1824 • a dot after the figures. 

 -T ( 1 P° Av* a dot under the letter S, and another 



i 1824* °°* ^^^ ^"® figures. 



No. 4. 



No. 5. 



1 P^ Av* a dot under the letter D, another dot 

 under the letter S, and a third dot 

 8 24 • after the figures. 



{': 



These weights were successively compared with the avoir- 

 dupois pound No. 1 . which was taken both before and after the 

 others ; for this purpose Mr. Robinson's balance was used. 



One hundredth of a grain occasioned a variation of 0,7 of 

 a division. 



Means. 



By the above comparisons the difference of each weight 

 from No. 1. is as follows; 



