io8 Capt. Kater on the length of the French metre 
The pieces C and c , applied. Distance from C to c, 500,5 
divisions. The word Fortin above. 
Tempe- 
rature. 
Reading o 
the microm. 
at 39,4 of 
the scale. 
Reading o 
the microm 
at the brass 
pieces. 
Differ- 
ence. 
Divisions to 
be deducted 
from 39,4 
inches. 
Length of the 
Metre. 
Corf, for 
temperature 
in decimals 
of an inch. 
Length of the 
Metre, the metre 
being at- 32°, and 
the scale at 62®. 
56,8 
5&7 
56,8 
56,8 
56,8 
15,0 
15-7 
14,7 
l 5>5 
15,5 
37’5 
40,0 
40,5 
40,0 
40,0 
22.5 
2 4»3 
25,8 
•24,5 
24.5 
523.0 
524,8 
526,3 
525.0 
525,0 
39,37762 
39,37754 
39,37747 
39,37753 
39,37753 
,00671 
,00673 
.00671 
,00671 
,00671 
39,37091 
39,37081- 
39,37076 
39,37082 
39,37082 
Mean 
39,37082 
The pieces D and d, applied. Distance from D to d, 4 56,7 
divisions. The word Fortin above. 
55,0 
55,2 
55’ 2 
I 56,0 
| 56,0 
35 » 3 
3 6 >5 
36,0 
26,5 
23»5 
93 .0 
95 ,° 
93 >° 
89.0 
87.0 
57 >7 
58.5 
57,0 
62.5 
6 3.5 
5 * 4,4 
515.2 
5 i 3,7 
519.2 
520.2 
39 , 3779 8 
39,37795 
39,37801 
39,37778 
39>37773 
,00709 
,00705 
,00705 
,00688 
,00688 
39.37089 
39.37090 
39,37096 
39,37090 
39,37085 
| Mean 
39,37090 
Summary of the preceding comparisons. 
The word “ Metre ” above - 
“ Fortin. 
{ 2 L"df; 3 3 9 9 f^} 39.37087 
{ D “and 39.37086 
Mean. 39,37086 
Subtract for error in division of the scale - — ,00005 
Length of the Metre a bouts in inches of Sir G. Shuck- 
burgh’s scale 
| 29, 37°8i 
The following is the manner in which the correction for 
temperature was obtained. The expansion of platina accord- 
ing to the experiments of Borda and others, is ,00000476 
