180 
CAPTAIN A. R. CLARKE ON THE COMPARISONS OE STANDARDS. 
of a millimetre, or 19-24 millionths of a yard. Adding this, we obtain for the length of 
the true metre 
J1=1-0936.2446Y 55 , 
the yard being at 62° F. The difference between this result and that derived through 
the Prussian, Belgian, and Russian toises is less than a millionth of a yard. We. shall 
adopt the first-determined value, as the probable error of the second is not assignable. 
The Yard. 
From numerous comparisons among different copies of the Standard Yard, it has been 
found that at 62°, Y 5S is too short by 0*40 ; or if p be the true yard , 
Y ss =g-0-40. 
If we substitute this value in our equations we have the following 
Final Results. 
1 
. 
Measures. 
Expressed in 
Terms of the 
Standard Yard. 
W- 
Expressed in 
inches. 
Inch=J ff 
Expressed in 
lines of the 
Toise. 
Line=^C. 
Expressed in 
Millimetres. 
Millimetre = 
ToWiH- 
I n>? t>artf 
1-00000000 
36 000000 
405-34622 
914-39180 
Copy No. 55 of the Yard at its Standard 
Temperature of 62-00 F. 
0-99999960 
35-999986 
405-34606 
914-39143 
Ordnance Standard Foot 
62-00 
0-33333284 
11-999982 
135Y152L 
304-79681 
Indian Standard Foot 
62-00 
0-33333611 
12-000100 
135-11653 
304-79980 
Ordnance 10-foot Bar O t 
62-00 
3-33333717 
120-000138 
1351-15563 
3047-97616 
Ordnance 10-foot Bar OI t 
62-00 
3-33335432 
120-000755 
1351-16259 
3047-99184 
Indian 10-foot Bar Ig 
- 
62-00 
3-33340138 
120-002450 
1351-18166 
3048-03488 
Indian 10-foot Bar Ib 
62-00 
3-33353284 
120-007182 
1351-23495 
3048-15508 
Indian 10-foot Bar Ij 
62-00 
3-33331457 
119-999324 
1351-14647 
3047-95550 
Australian Standard 01 4 
62-00 
3-33330427 
119-998954 
1351-14230 
' 3047-94608 
Australian Standard OI c 
11 
62-00 
3-33333747 
120-000149 
1351-15576 
3047-97644 
Ordnance Toise 
ii 
61-25 
2-13166458 
76-739925 
864-06219 
1949-17660 
Ordnance Metre 
61-25 
1-09374800 
39-374928 
443-34662 
1000-11420 
Royal. Society’s Metre a traits „ 
32-00 
1-09360478 
39-369772 
443-28857 
999-98324 
Prussian Toise No. 10 
61-25 
2-13150911 
76-734328 
863-99917 
1949-03444 
Belgian Toise No. 1 1 
61-25 
2-13150851 
76-734306 
863-99893 
1949-03390 
Russian Double Toise P 
61-25 
4-26300798 
153-468287 
1727-99419 
3898-05952 
CflteF 
2-13151116 
76-734402 
864-00000 
1949-03632 
Ki)t fflttte 
1-09362311 
39-370432 
443-29600 
1000-00000 
Table of Logarithms for converting Geodetical Distances. 
Logarithmic multipliers to convert into 
, Distances to be converted. 
Peet. 
Metres. 
Toises. 
Distances given in the “ Account of the 
Principal Triangulation of Great 
Britain’-’ 
Distances expressed in Metres 
Distances expressed in Toises 
1 0-00000050 
9-48401156 
9-19419163 
J 
0-51598894 
0-80580887 
0-28981993 
9-71018007 
