[ 322 ] 
In the line AB, what the levels make more than the chain, between the mile pofts, 
is as follows. 
Miles from 
Diff. in 
Miles from 
Diff. in 
the point 
feet. 
the point 
feet. 
("Here appears to be an 
A. 
A. 
1 
8l 
8o 
Hi } 
43 
}? : 
error of one chain z=;66 
feet, in the chain mea- 
4 2 
fure, as obferved before. 
7 8 
3°i 
40 
16 j 
Lp, 3x8. 
76 
25 
39 
8 
75 
14 
3 8 
14 
72 
43 
37 
H 
7 ° 
3 2 i 
3 6 
Hi 
66 
6 1 
35 
H 
65 
I 5 ~" 
34 
Hi 
63 
33 + 
33 
Hi 
61 
32i 
28 
79i 
60 
i 6 | 
27 
15 
59 
i 5 i 
25 
32 
58 
i 6 | 
24 
20f. 
57 
Hi 
23 
14 
5 6 
15 
22 
Ilf 
55 
13 
21 
I2f 
54 
I2§ 
19 
22 
53 
ioi 
18 
I 4 l 
52 
i a* 
15 
29 
51 
1 1 
13 
Hi 
50 
13 
12 
5 
49 
1 1 
10 
f I Jr 
1 1 Z 
48 
9 z 
9 
8 
47 
9 i 
8 
/ 2, 
45 
J 7 l 
6 
.14 
44 
7 
4 
23 
43 
9 1 
2 
13 
0 
2I| 
We took notice of thefe differences as we meafured from B to A, always finding the 
miles greater by the chain meafure, by the quantity above, which fhews that the chain 
was continually extending itfelf by ufe ; as we had dire£t proof of, being obliged to 
contraft it every day, and re-adjuft it to its proper length by means of the ftandard 
chain. 
To 
