THE IvT]W NATIONAL STANDARD OE LENGTH, AND ITS PRINCIPAL COPIES. 088 
Excess above Bronze 28. 
Bar. 
Old measur 
Bronze 12 
d. 
+ 1-84 
Bronze 39 
+ 1-21 
Bronze 15 
-2-92 
Bronze 11 
+ 1-96 
Bronze 30 
+ 3-24 
Bronze 29 
+ 4 60 
Bronze 1 
+ 2-08 
Bronze A 
-3-50 
Bronze B 
+ 3-09 
Bronze 16 
+ 0-56 
Bronze 18 
— 2-48 
Bronze 5 
+ 0-52 
Bronze 4 
+ 4-63 
Bronze 8 
+ 1-70 
Bronze 17 
-1-30 
ew measure. 
d. 
+ 4-50 
+ 4-77 
+ 0*45 
-1-63 
+ 2-58 
+ 2-66 
+ 3-01 
+ 3-70 
+ 4*28 
+ 4-05 
Bar. 
Bronze 14 
Bronze 23 
Bronze 21 
Bronze 9 
Bronze 22 
Bronze 3 
Old measure. 
d. 
1-3-85 
4 - 2-21 
4 - 1-86 
+ 7-64 
4-2-40 
— 2-28 
I —2-51 
f -4 4-15 
J +4-51 
] +3-57 
L+4-59 
— 0-65 
Bronze 6 
Bronze 26 
Bronze 27 
Bronze 25 
+ 2-58 
+ 5-05 
+ 1-79 
+ 0-25 
New measure. 
d. 
/ +3-69 
I +2-98 
r +3-46 
J +2-50 
1 +1-76 
I +2-87 
r +4-51 
I +4-80 
+ 8-06 
+ 3-40 
r -1-56 
\ +0-04 
+ 3-89 
+ 4-75 
+ 1-31 
f +0-91 
{ +0-10 
-Ml 
- 1-10 
+ 2-87 
r +0-17 
Z -0-20 
(_ +0-58 
+ 4-83 
+ 2-75 
f-0-07 
' -0-92 
-1-28 
(^ — 1-84 
Bronze 13 
Bronze 24 
+ 1-35 
+ 3-02 
J -0-04 
1 +2-25 
L+P90 
f + 4-96 
j +2-88 
] +4-98 
L + 3-96 
The order in which I have placed the bars is the same as the chronological order of 
the first of the New Observations on each bar. On examining them it will be found, — 
First, that there is no evidence whatever of a general preponderance of excess from the 
New Measures above excess from the Old Measures ; the signs -j- and — being inter- 
mixed, in the differences, in all possible ways ; and the mean of the wFole being less 
than 0‘*-50. Secondly, that the only instance which fairly supports the conclusion 
deduced from Cast Steel D is the first of all, namely. Bronze 12. Cast Steel D was com- 
pared on April 13, 14, and 16 ; Bronze 12 on April 26, 27, 28, and May 1; Bronze 39 
(the next) on April 30. The conclusion, I think, is inevitable, that Bronze 28 really was 
shortened at the beginning of April ; that it recovered its exact length before April 30 ; 
but that this recovery took place with some fluctuations, so that on May 1 it was sub- 
ject nearly to the same error as before. Bronze 21, observed on June 26, exhibits a 
similar discordance. What circumstances can have produced these changes, or how far 
the later fluctuations are apparent rather than real, 1 am wholly unable to conjecture. 
1 know not whether Mr. Sheepshanks intended to continue this series of comparisons. 
Those which are given are clearly sufficient to establish the general trustworthiness of 
all the measures ; and Mr. Sheepshanks, as they advanced, had expressed himself in a 
great measure satisfied. 
