368 
CAPTAIN KATER ON THE ERROR IN 
With wires .012 of an inch diameter. 
From 0 to 36 inches. 
Without Wires. 
A Wire under 
Wires under 
Error when curved 
Error when curved 
Sum of 
the middle. 
the ends. 
upwards. 
downwards. 
Errors. 
div. 
div. 
div. 
div. 
div. 
div. 
99-0 
95.5 
105.0 
99-0 
95.5 
106.0 
Mean 99.0 
95.5 
105.5 
3.5 
6.5 
10.0 
0.0 Reduction to the Chord. 
99.0 
With wires .02 of an inch diameter. 
Without Wires. 
A wire under 
Wires under 
Error when curved 
Error when curved 
Sum of 
the middle. 
the ends. 
upwards. 
downwards. 
Errors. 
div. 
div. 
div. 
div. 
div. 
div. 
6.0 
3.0 
14.0 
3.0 
0.5 
17.0 
97-0 
92.0 
109-3 
96.0 
94.0 
109.0 
Mean 50.5 
47.4 
62.3 
3.1 
11.8 
14.9 
0.2 Reduction to the Chord. 
50.7 
With wires .03 of an inch diameter. 
Without Wires. 
A Wire under 
Wires under 
Error when curved 
Error when curved 
Sum of 
the middle. 
the ends. 
upwards. 
downwards. 
Errors. 
div. 
div. 
div. 
div. 
div. 
div. 
97.0 
92.7 
110.2 
96.5 
92.0 
111.0 
Mean 96.7 
92.3 
110.6 
4.8 
13.5 
18.3 
0.4 Reduction to the Chord. 
97-1 
With wires .04 of an inch diameter. 
Without Wires. 
A Wire under 
Wires under 
Error when curved 
Error when curved 
Sum of 
the middle. 
the ends. 
upwards. 
downwards. 
Errors. 
div. ’ 
div. 
div. 
div. 
div. 
div. 
16.0 
7.5 
32.0 
12.0 
8.0 
30.7 
94.5 
87-0 
114.0 
Mean 40.6 
34.2 
58.9 
7.2 
17.5 
24.7 
0.8 Reduction to the Chord. 
41.4 
