- B6 -
APPENDIX B
NATIONAL BUREAU OF STANDARDS TEST RESULTS
Table A3. (Cont.) Hardness Test Results,
Eye C3, Segment O
Specimen I - Plane 0.8 in. from south face
Distance from hole
Vickers hardness number
1.0 mm
0.04 in.
247 251
3
.12
238 236
5
.20
240 238
7
.28
240 236
9
.35
233 235
11
.43
235 233
Specimens II and III - Planes parallel to faces
Distance from fracture
Vickers hardness numbers
II-close to north face
III-1/4 in. from north face
1.0 mm
0.04 in.
232 249
2
.08
230 247
3
.12
232 247
4
.16
230 249
5
.20
233 251
6
.24
235 251
7
.28
236
8
.31
232
9
.35
228
Specimen IV - Plane 5 in. from hole surface
Distance from north face
Vickers hardness numbers
0.5 mm
0.02 in.
1
.04
2
.08
3
.12
4
.16
5
.20