in Buling his Test-Plates. By William A, Bogers. 79 
TABLE III. 
PERIODIC ERRORS. 
T. 
Nobert. 
II. 
Rutlierford. 
III. 
Rogers. 
fraction of inch. 
fraction of inch. 
fraction of inch. 
1 
+ 
1 
21700 
1 
33800 
1 
44700 
2 
1 
4- 1 
1 
30400 
' 152000 
22400 
3 
+ 
1 
16900 
• 30400 
1 
11500 
4 
+ 
1 
1 
1 
21700 
152000 
8700 
5 
+ 
1 
^ 33800 
1 
21700 
6900 
6 
+ 
1 
+ 1 
1 
13800 
^ 152000 
6000 
7 
+ 
1 
7600 
1 
43400 
_ 
1 
5700 
8 
+ 
1 
11500 
1 
30400 
_ 
1 
5600 
9 
+ 
1 
12700 
1 
33800 
__ 
1 
5700 
10 
+ 
1 
19000 
1 
~~ 50700 
1 
7200 
11 
1 
1 100300 
__ 
1 
9900 
12 
+ 
1 
21700 
1 
50700 
- 
1 
"19500 
13 
+ 
1 
19000 
60800 
1 
47000 
14 
+ 
1 
1 
+ 
1 
25300 
38000" 
380000 
15 
+ 
1 
10900 
1 
30400 
+ 
1 
50700 
16 
+ 
1 
8900 
1 
76000 
+ 
1 
15800 
17 
+ 
1 
16900 
1 
60800 
+ 
1 
T8500 
18 
+ 
1 
38000 
1 
50700 
+ 
1 
19500 
19 
1 
1 
H- 
1 
152000 
100300 
44700 
20 
0 
0 
0 
