new standards of weights and measures. 29 
By the above comparisons the error of each weight in 
parts of a grain is as follows : 
No. 1. 
No. 2. 
No. 
3. No. 4 . 
— ,192 
— ,202 
— ,336 — 
,110 
Results of the comparisons of the four 
gallon of water. 
weights of the imperial 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
Grains. 
Grains. 
Grains. 
Grains. 
1st series . . 
,272 
,169 
— ,186 
— ,167 
2nd series . . 
— ,155 
— ,33 4 
— ,416 
— ,046 
3d series . 
— ,192 
— ,202 
— ,336 
— ,110 
Mean errors . 
,20 6 
— ,235 
— ,313 
— ,108 
A wire equal to its error was now enclosed in each weight. 
The numbers and values of the wires inclosed in the gallon 
weights are as follow : 
Grains. 
No. 1. contains 2 wires, together = 0,366 
No. 2. — 4 wires, — =1,174 
No. 3. — 3 wires, — = 0,791 
No. 4. — 3 wires, — = 0,422 
The adjustment of the gallon weights occupied me till the 
10th of April, when the balance was removed to Mr. Bate's 
for the purpose of adjusting the standard gallon measures. 
Adjustment of the imperial gallon measures. 
It has been remarked that the form chosen for the gallon 
measure is that of a hollow cone, terminated by a cylindrical 
mouth of about an inch and a half diameter. The inside of 
