estimated in Parts of the English Standard. 435 
The pieces C and c applied. Distance from C toc, 
500-5 divisions. The word Fortin above. 
Piel 2 23 ae ; Bg Bo 
g jeg '224| = (23: | 2. [dee [fans 
2 [Sees Cts! 2 [2882] Se |peeals saz 
s wee og wh) 8 |2s 2 as @lae Ss) a gaig's 
S [eee 58e| 5 S882) 22° esleso 2 
B jefe (268) 2 SEF) (FF less |PeSeg 
SO Rai 9) eae aden oe CO rt: F< ie 
568} 150 | 37-5 | 225 | 523-0 (39 37762| 00671 | 39-57091 
567 | 15°T | 40-0 | 243 | 524-8 |59°37754| 00673 | 39°37081 
568 | 147 | 40:5 | 25-8 | 5263 [39 SVT47] OOGT1 | 59-37076 
568 | 15:5 | 40-0 | 245 | 525-0 139:57753} 00671 | 59°37082 
568} 15:5 | 400 | 245 | 525-0 [3937753] 00671 | 3937082 
Mean | 39*57032 
The pieces D and d applied. Distance from D to d, 
456°7 divisious. The word Fortin above. 
55-0") S95 G30 | 57°T | S144 139°377T9S}] UUTLS | 59°ST7089 
55:2 | 365 | 95°0 | 58:5 | 515-2 139°37795] 00705 | 39°57090 
55:2 | 35:0 | 93:0 | 570 | 513°7 |39°37801} 00705 | 3957096 
560 | 965 | 890 | 62°5 | 519:2 13937778] 00688 | 39°57090 
5460 | 23:5 | 870 | 63-5 | 520-2 [3937775] 00688 | 59-S7085 
a 
Mean 39°S7090 
5 D and d, 59°37084 
¢ ? , y Oe 
The word ‘* Méire” above .. ; C and ¢, 39°37089 
C and ¢, 39°37082 ag.an 
D and d, ie ha Gnuse 
Mean 39°37086 
Subtract for errror in division of the scale +. *—"0005 
Length of the Métre a bouts in inches of Sir G. Shuck- 39-97 
burgh’s*seaie’ 2. ht. eet sia BP AES 
}s9-97087 
| Summary of the preceding comparisons. 
| “—Porun* of 
The following is the manner in which the correction for tem- 
perature was obtained. The expansion of platina according to 
the experiments of Borda and others, is ‘00000476 parts of its 
length for one degree of Fahrenheit; and as this is the expansion 
used by the French in adjusting the length of their métre, it 
must be employed on the present occasion, The métre being 
taken at 32°, the expansion for the difference between this and 
the temperature of measurement must be subtracted from the 
apparent length of the métre. The English standard tempera- 
ture is 62°: therefore, if the temperature of measurement be un- 
der this, the expansion ofthe scale for such difference of tempe- 
rature must be deducted from the length of tle métre before ob- 
tained. These two corrections are combined in the column en- 
titled ‘* Correction for temperature.” Sir G. Shuckburgh’s stan- 
dard scale is of cast brass; and as I could not conveniently deter- 
mine its actua! expansion with that degree of accuracy that would 
have satisfied me, I have taken for it, the mean result of two ex- 
Ee2 periments 
