life Captain Kater's account of the 



That which I shall call |T^ P° 

 No. 1. \ 1824 



No. 2. 



all CY 



.1. (.1 



CT 



I 1824* a dot after the figures. 



No. 3. I •'■ * *^ • * dot under the letter D. 

 ( 1834 



No. 4. < * . a dot under the letter D, and another 



^- * * ^l824. dot after the figures. 



T. -r ( T y P ° a dot under the letter Y, another dot 



No. 5' \ ^QnA * under the letter D, and a third dot 

 (lei 24. 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. 



