Mining Engineers' Handbook, Volume 2Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 15-32
... hole except during a slight rebound . In certain types , an " anvil block " is placed between the piston and end of drill steel . 66 Drill steel ordinarily used has a small hole running through it longitudinally ; it is called " hollow ...
... hole except during a slight rebound . In certain types , an " anvil block " is placed between the piston and end of drill steel . 66 Drill steel ordinarily used has a small hole running through it longitudinally ; it is called " hollow ...
Halaman 15-38
... hole and moving drill ; all drilling operations being intermittent . In soft rock , where the actual time of ... hole , e min ; to drill 1 ft , d min per ft ; to move drill and lost time , I min ; to set up drill , g min . Length of feed ...
... hole and moving drill ; all drilling operations being intermittent . In soft rock , where the actual time of ... hole , e min ; to drill 1 ft , d min per ft ; to move drill and lost time , I min ; to set up drill , g min . Length of feed ...
Halaman 18-3
... hole punched or bored through it ; very satisfactory , but subject to corrosion . This spad is improved by making the hole triangular , point down , either بالباط h ! ! Cement by filing , or by using a triangular punch made from a file ...
... hole punched or bored through it ; very satisfactory , but subject to corrosion . This spad is improved by making the hole triangular , point down , either بالباط h ! ! Cement by filing , or by using a triangular punch made from a file ...
Isi
COMPRESSED | 15 |
Applications Definitions Data | 15-44 |
Accident Compensation Pensions | 16-1 |
Hak Cipta | |
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