new standards of weights and measures. 



That which I shall calif ^^ ^^ 



No.i.j. 



«7 



IMP. GALL. 

 OF WATER AT 62° F 



VO: 



COF 

 ). 3. \ 



>. 4. \ 



wt of 



IMP. GALL. " ^'^"' 



WATER AT 62° F. a dot after the letter F. 



Wt of 



IMP. GALL. \ ; 



OF WATER AT 62S. J a dot after the figures. 



Wt of 



IMP. GALL. p,i + i 



OF WATER AT 62? F. a dot after the figures, 



and another dot after 

 the letter F. 



The two 6 lb. troy weights with 880 grains, making toge- 

 ther ten pounds avoirdupois, were employed as a standard 

 in the manner which has been already detailed in describing 

 the adjustment of the troy pounds. ^^ 



From previous rough trials, certain wires were added to 

 each of the gallon weights, the value of which will be given 

 hereafter, and the following comparisons were made. The 

 index of the balance varied one division with one-tenth of a 

 grain. _ 



