LIEUT.-COL. A. R. CLARKE ON STANDARDS OF LENGTH. 
46!) 
If we compare this with our results for P, viz. 
P=2T 0 - 323-90, 
we get for the difference 
P_Q=33-97, 
which agrees at least very satisfactorily with the difference of length as determined at 
Pulkowa, viz. 33-80. 
The length of the bar P, as adopted in the ‘ Comparisons of Standards,’ was that 
assigned to it in Struve’s ‘Arc du Meridien,’ vol. i., viz. 1727-99440. But it appears 
that more recent comparisons at Pulkowa brought to light a decided alteration of length 
in P, and show that the length of P is to be taken as 
P = 1727-98756. 
For the bar Q the length to be used is 
Q=1727-97386. 
Measures. 
Standard 
Tempe- 
rature. 
Expressed in 
Terms of the 
Standard Yard. 
b- 
Expressed in 
Inches. 
Inch=Y<r b 
Expressed in 
lines of the 
Toise. 
Line = ^ ? 1£ 
Expressed in 
Millimetres. 
Millimetre— 
ToVo JH- 
Parlr 
Fahr. Ther. 
1 00000000 
36000000 
405-34622 
914-39179 
914-39144 
Copy No. 55 
62 00 
0-99990960 
35-999986 
405-34608 
Ordnance Half Klafter 
61-25 
1-03693714 
37-329737 
420-31855 
948-16681 
Klafter, Pulkowa Copy 
61-25 
2-07403658 
74-665317 
840-70290 
840 69399 
1 896-48203 
Klafter, Milan Copy [1.3] 
61-25 
207401462 
74664526 
1896-46195 
Klafter' Milan Copy [I . II] 
61-25 
2-07402990 
74-665076 
840-70019 
1896-47592 
1948-84492 
4000-40522 
999-97527 
Toise laid off on Pulkowa Copy of Klafter . . . 
61-25 
61-25 
213130185 
4-37493562 
76-726867 
157-497682 
863-91516 
1773-36363 
443-28504 
American Metre No. 6 
32-00 
1-09359607 
39-369459 
Russian Double Toise P, between the centres 
of terminal disks 
] 61-25 
4-26300289 
153-468104 
1727-99212 
3898 05485 
61-25 
4-26297129 
153-466966 
1727-97931 
1351T3491 
3898-02596 
Cape 10-foot Standard 
62-00 
3-33328605 
119-998298 
3047-92941 
Cft matter 
207403483 
74-665254 
840-70219 
1896-48043 
Inches. 
Millimetres. 
Royal Cubit 
Common Cubit 
20-727 
18-240 
526-46 
463-29 
3 R 
MDCCCLXXlll 
