|
|
|
|
|
|
|
|
|
Hardness scale units
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
Ohs knoop 1 (?) 2 32 3 135 4 163 5 395 6 560 7 710-790 8 1,250 9 1, 700-2, 200 >9 2,800 >9 3,200 >9 3,500 10 8, 000-8, 500
|
|
|
Diamond machine equipped with a rotary table or bushing or, английский
On a petroleum-type rotary drill. as the table is rotated, the grief stem turns and drives the drilling-string assembly to which it is coupled. also called grief joint, kelly joint, kelly stem.
Corncob bit, английский
Obsolete synonym for taper bit. see taper bit.
|
|
|
|
|
|
|
