27 
new standards of weights and measures . 
That which I shall call 
No. 3. 
No. 2. 
No. 3. 
No. 4 - 
{ 
S 
{ 
{ 
W' OF 
IMP. GALL. 
OF WATER AT 6 z° F 
W' OF 
IMP. GALL. 
OF WATER AT 6 z° F. a dot after the letter F. 
W-r OF 
IMP. GALL. 
OF WATER AT 62° F a dot after the figures. 
Wt OF 
IMP. GALL. 
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. 
The two 6 lb. 
weights 
+ 880 grains. 
Divisions. 
.ij.v frolfiO 
Gallon weights. 
The two 6 lb. 
weights 
4 880 grains. 
No. 1. 
Divisions. 
No. 2. 
Divisions. 
No. 3. 
Divisions. 
No. 4. 
Divisions. 
+ 2>5 
— 3,2 
4 2,5 
4 0,8 
+ 5,4 
4 
4 5>8 
+ 3,9 
4 2,7 
-1,5 
4 2,1 
+ 4,3 
— 0,6 
- L 4 
— 3,3 
- 17 
— 2,1 
— L 7 
— 0,8 
— 6,4 
— 4.1 
— 0,9 
— 8,1 
4 0,4 
— 0,1 
— 2,8 
— 0,2 
+ C 5 
4 1,2 
— 2,5 
— 3,0 
— 2,0 
— 3>3 
— 4>9 
- 4,1 
— 2,2 
+ 0,63 
— 1,98 
— 0,9s 
— 1,12 
— 0,93 
4 0,85 
+ 0,85 
+ o ,74 j 
Mean. 
