12 
Captain Kater’s account of the 
That which I shall call 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
No. 5. 
fT Y P D 
\ 1824 
cT Y P D 
^ 1824* a dot after the figures. 
i T Y P . a dot under the letter D. 
1824 
i T P . a dot under the letter D, and another 
1 824* dot after the figures. 
t: p : a dot under the letter Y, another dot 
under the letter D, and a third dot 
{ 
1824- 
after the figures. 
The Imperial Standard troy pound was put into the scale, 
and counterpoised. The division and fraction of a division 
which would have been pointed out by the index, had the 
beam been allowed to come to a state of rest, was ascertained 
by taking the mean of the extremes of the vibrations, when 
their extent did not exceed one division. By this much time 
was saved, and it is presumed greater accuracy attained. 
The standard pound was then removed and replaced by the 
copy, and the point of rest determined as before : the dif- 
ference between these means converted into parts of a grain, 
gave the error of the copy. The same method was followed 
in the adjustment of all the weights. 
No. 1 . being too heavy, was laid aside for the present. 
No. 3. being too light for the limits of the index, was also 
set aside. 
By many careful trials, one-hundredth of a grain occasioned 
a variation in the index of 0,67 divisions. 
