various British standards of linear measure. 
85 
Readings of the sixth 
interval. 
Readings of the 40 inch 
bar. 
8 l ,5 
85,0 
85.3 
85,0 
82.7 
S6,o 
83,0 
83,0 
83 ^ 
83,0 
83,0 
82,0 
82,5 
82,6’ 
82,2 
82,6 
82,5 
81,3 
82,0 
81,5 
82,7 
82,5 
82,0 
81,3 
82,7 
83,0 
From this it appears, that the forty inch bar is shorter than 
the sixth interval 0,3 of a division ; and as the sixth interval 
was found to be shorter than the mean of all the intervals 
0,5 of a division, the result of the whole is, that the forty inch 
bar is shorter than one sixth of Ramsden’s bar 0,8 of a divi- 
sion, or ,000034 an i nc h- 
I may here remark, that the differences observable between 
the results of the various comparisons of the intervals of 
Ramsden’s bar, may be attributed to the large size and im- 
perfect state of most of the dots ; those bounding the sixth 
interval are fortunately the least injured. 
Having thus obtained the value of the standard, from which 
the chain used in the Trigonometrical Survey was actually 
laid off, I next proceeded to compare this with General Roy’s 
and Sir George Shuckburgh’s scales. 
